1. A light emitting device package comprising:
a package substrate;
a blue light emitting device and a green light emitting device mounted on the package substrate;
a flow prevention part formed on the package substrate and substantially enclosing the blue light emitting device; and
a wavelength conversion part including a red wavelength conversion material and formed on a region defined by the flow prevention part to cover the blue light emitting device.
2. The light emitting device package of claim 1, wherein the flow prevention part is a protrusion part substantially enclosing the blue light emitting device.
3. The light emitting device package of claim 2, wherein a height of the protrusion part is substantially equal to a mounting height of the blue light emitting device.
4. The light emitting device package of claim 2, wherein the protrusion part includes a plurality of protrusion parts having respective heights increased in a direction away from the blue light emitting device, and the wavelength conversion part is formed in a region defined by any one of the plurality of protrusion parts.
5. The light emitting device package of claim 1, wherein the flow prevention part is a groove part substantially enclosing the blue light emitting device.
6. The light emitting device package of claim 5, wherein the groove part includes a plurality of groove parts, and
the wavelength conversion part is formed in a region defined by any one of the plurality of groove parts.
7. The light emitting device package of claim 1, further comprising a recess part formed in the package substrate,
wherein the blue light emitting device is disposed within the recess part and the green light emitting device is disposed outside the recess part, and
the flow prevention part is a boundary surface of the recess part.
8. The light emitting device package of claim 7, wherein a height of the boundary surface of the recess part is substantially equal to a mounting height of the blue light emitting device.
9. The light emitting device package of claim 1, wherein the wavelength conversion part has hydrophilic properties or hydrophobic properties, and
the flow prevention part has hydrophobic properties or hydrophilic properties opposite to those of the wavelength conversion part, and is provided as a hydrophobic region or a hydrophilic region substantially enclosing the blue light emitting device.
10. The light emitting device package of claim 1, further comprising an encapsulation part formed on the package substrate,
when a combination of light emitted from the blue light emitting device and light emitted from the wavelength conversion part is defined as first combined light, the first combined light is mixed with light emitted from the green light emitting device within the encapsulation part.
11. The light emitting device package of claim 10, wherein the encapsulation part includes a second wavelength conversion material.
12. The light emitting device package of claim 11, wherein the second wavelength conversion material is a red wavelength conversion material, and
a concentration of the second wavelength conversion material is lower than that of the red wavelength conversion material included in the wavelength conversion part.
13. The light emitting device package of claim 12, wherein when a combination of the first combined light and the light emitted from the green light emitting device is defined as second combined light, a concentration of the second wavelength conversion material is set to correct a deviation of actual color characteristics of the second combined light from desired color characteristics thereof.
14. A method of manufacturing a light emitting device package, the method comprising:
preparing a blue light emitting device, a green light emitting device, and a wavelength conversion part including a red wavelength conversion material and formed on a top surface of the blue light emitting device;
measuring color characteristics of first combined light when the first combined light is defined by a combination of light emitted from the blue light emitting device and light emitted from the wavelength conversion part;
mounting the blue light emitting device having the wavelength conversion part formed thereon and the green light emitting device on the package substrate; and
forming an encapsulation part on the package substrate.
15. The method of claim 14, wherein the encapsulation part includes a second wavelength conversion material, and
when a combination of the first combined light and light emitted from the green light emitting device is defined as second combined light, a concentration of the second wavelength conversion material is set to correct a deviation of actual color characteristics of the second combined light from desired color characteristics thereof based on the measured color characteristics of the first combined light.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A magnetic-disk evaluation apparatus, for evaluating a magnetic disk having a plurality of temporary servo signals, comprising:
a spindle motor;
said spindle motor operating said magnetic disk at a rotation speed effective to enable an evaluation of said magnetic disk;
a rotary positioner supporting a magnetic head about a rotation shaft;
said magnetic head operable relative to said spindle motor and said magnetic disk;
control means for controlling said rotary positioner and said magnetic head on a basis of said plurality of temporary servo signals and positioning said magnetic head relative to a concentric circle centered on said spindle motor prior to said evaluation of said plurality of temporary servo signals;
measurement means for accurately measuring a head displacement of said magnetic head in a seek direction relative said magnetic disk;
detection means for detecting a tip displacement of a tip of said magnetic head on a basis of said head displacement in said seek direction; and
determination means for determining whether said temporary servo signals are acceptable, on a basis of said tip displacement, effective to allow said magnetic-disk evaluation apparatus to effective and rapidly evaluate said magnetic disk.
2. A magnetic-disk evaluation apparatus, according to claim 1, further comprising:
fixation means for temporary fixing said rotary positioner effective to locate said magnetic head at an arbitrary position on said magnetic disk; a positioner rotating stage for supporting said fixation means and said rotary positioner and moving said rotary positioner, fixed by said fixation means, to an arbitrary position on said magnetic disk;
said positioner rotating stage rotating around a rotating center;
a measuring rotating arm rotating around the same said rotating center as said positioner rotating stage based on a movement angle of said positioner rotating stage; and
said measurement means on said measuring rotating arm, whereby said measurement means is positioned to effectively measure said displacement of said magnetic head in said seek direction.
3. A magnetic-disk evaluation apparatus according to claim 2, wherein said control means further comprises:
storage means for storing an eccentricity of said magnetic disc measured on a basis of a first signal from said magnetic head reading said temporary servo signals while said rotary positioner is fixed by said fixation means;
cancel means for canceling said eccentricity of said magnetic disk in said first signal from said magnetic head by receiving a feed forward input of said eccentricity stored in said storage means and by generating a second signal; and
feedback compensating means for generating, from at least said second signal sent from said cancel means, a third signal for feedback-controlling of said rotary positioner, enabling effective cancellation of eccentricity in a speedy manner.
4. A magnetic-disk evaluation apparatus according to claim 3, wherein:
said measurement means is a laser Doppler vibrometer effective to measure said displacement of said magnetic head in said seek direction by irradiating a side of said magnetic head with a plurality of laser beams and receiving a reflection therefrom.
5. A magnetic-disk evaluation apparatus, for evaluating a magnetic disk having a plurality of temporary servo signals, comprising:
a spindle motor;
said spindle motor operating said magnetic disk at a rotation speed effective to enabling an evaluation of said magnetic disk;
a rotary positioner supporting a magnetic head about a rotation shaft;
said magnetic head operable relative to said spindle motor and said magnetic disk;
control means for controlling said rotary positioner and said magnetic head on a basis of said plurality of temporary servo signals and positioning said magnetic head relative to a concentric circle centered on a center of said spindle motor prior to said evaluation of said plurality of temporary servo signals;
measurement means for accurately measuring a head displacement of said magnetic head in a seek direction;
detection means for detecting a tip displacement of a tip of said magnetic head on a basis of said head displacement in said seek direction;
determination means for determining whether said temporary servo signals are acceptable, on a basis of said tip displacement, effective to allow said magnetic-disk evaluation apparatus to effective and rapidly evaluate said magnetic disk;
fixation means for temporary fixing said rotary positioner effective to locate said magnetic head at an arbitrary position on said magnetic disk;
a positioner rotating stage for supporting said fixation means and said rotary positioner and moving said rotary positioner, fixed by said fixation means, to an arbitrary position on said magnetic disk;
said positioner rotating stage rotating around a rotating center;
a measuring rotating arm rotating around the same said rotating center as said positioner rotating stage based on a movement angle of said positioner rotating stage; and
said measurement means on said measuring rotating arm, whereby said measurement means is positioned to effectively measure said displacement of said magnetic head in said seek direction.
6. A magnetic-disk evaluation apparatus, comprising:
a magnetic disk including a plurality of temporary servo signals;
a spindle motor on said magnetic-disk evaluation apparatus;
said spindle motor effective to enable an evaluation of said magnetic disk;
a magnetic head operable relative to said spindle motor and said magnetic disk;
a rotary positioner supporting said magnetic head about a rotation shaft;
said rotation shaft supporting at least said magnetic head and said rotary positioner;
voice coil means at a first end of said rotary positioner opposite said magnetic head effective to drive said rotary positioner on a basis of a command;
control means for issuing said command and controlling said rotary positioner on a basis of said plurality of temporary servo signals and positioning said magnetic head relative to a concentric circle centered on a center of said spindle motor prior to said evaluation of said plurality of temporary servo signals;
measurement means for accurately measuring a first displacement of said magnetic head in a seek direction;
detection means for detecting a second displacement of a tip of said magnetic head on a basis of said first displacement in said seek direction; and
determination means for determining whether said temporary servo signals are acceptable, on a basis of said second displacement, effective to allow said magnetic-disk evaluation apparatus to effective and rapidly evaluate said magnetic disk.
7. A magnetic-disk evaluation apparatus for evaluating a magnetic disk, comprising:
a base effective to support said magnetic-disk evaluation apparatus;
a spindle motor on said base;
said spindle motor rotatable at an arbitrary rotation speed effective to enable said evaluation of said magnetic disk;
a magnetic head operable relative to said spindle motor;
said magnetic head effective for recording signals on and for reproducing signals from said magnetic disk to enable said evaluation;
a suspension supporting said magnetic head;
a rotary positioner supporting said suspension about a rotation shaft;
a voice coil at a first end of said rotary positioner opposite said magnetic head;
said rotation shaft cantilevered from said base and supporting said magnetic head, said suspension, and said rotary positioner;
a first and a second magnet opposite a respective first and second side of said voice coil;
said magnetic disk including a plurality of temporary servo signals;
control means for control driving of said rotary positioner on a basis of said plurality of temporary servo signals and being effective to position said magnetic head on a circle concentric to a center of said spindle motor, prior to an initial evaluation of said plurality of temporary servo signals;
measurement means for measuring a head displacement of said magnetic head in a seek direction;
detection means for detecting a tip displacement of a tip of said magnetic head on a basis of said head displacement in said seek direction; and
determination means for determining whether said temporary servo signals are acceptable, on a basis of said tip displacement, whereby said magnetic-disk evaluation apparatus can rapidly and effectively evaluate said magnetic disk.
8. A magnetic-disk evaluation apparatus according to claim 7, further comprising:
fixation means for temporarily fixing said rotary positioner effective to locate said magnetic head at an arbitrary position on said magnetic disk;
a positioner rotating stage for supporting said fixation means and said rotary positioner and moving said rotary positioner, fixed by said fixation means, to an arbitrary position on said magnetic disk;
said positioner rotating stage rotating around a rotating center; and
a measuring rotating arm rotating around the same said rotating center as said positioner rotating stage based on a movement angle of said positioner rotating stage; and
said measurement means on said measuring rotating arm, whereby said measurement means is positioned to effectively measure said displacement of said magnetic head in said seek direction.
9. A magnetic-disk evaluation apparatus, according to claim 7, wherein:
said measurement means is a laser Doppler vibrometer effective to measure said displacement of said magnetic head in said seek direction by irradiating a side of said magnetic head with a plurality of laser beams to receive a reflection therefrom.
10. A magnetic-disk evaluation apparatus, according to claim 8, wherein:
said measurement means is a laser Doppler vibrometer effective to measure said displacement of said magnetic head in said seek direction by irradiating a side of said magnetic head with a plurality of laser beams to receive a reflection therefrom.
11. A magnetic-disk evaluation apparatus according to claim 8, wherein said control means further comprises:
storage means for storing an eccentricity of said magnetic disc measured on a basis of a first signal from said magnetic head reading said temporary servo signals while said rotary positioner is fixed by said fixation means;
cancel means for canceling said eccentricity of said magnetic disk in said first signal from said magnetic head by receiving a feed forward input of said eccentricity stored in said storage means and by generating a second signal; and
feedback compensating means for generating a third signal for feedback-controlling of said rotary positioner, from said second signal sent from said cancel means whereby said eccentricity is effectively canceled in a speedy manner.
12. A magnetic-disk evaluation method for evaluating a magnetic disk, employing a magnetic-disk evaluation apparatus having a base as a support for said apparatus, a spindle motor on said base for rotating said magnetic disk at an arbitrary rotation speed, a magnetic head for recording and reproducing signals on and from said magnetic disk effective to evaluate said magnetic disk, a suspension supporting said magnetic head, a rotary positioner supporting said suspension, a voice coil at first end of said rotary positioner opposite to said magnetic head, a rotating shaft cantilevered from said base, a first and a second magnet opposite a respective first and a second side of said voice coil, said magnetic disk including a plurality of temporary servo signals, said rotating shaft supporting said magnetic head, said suspension, and said rotary positioner, comprising:
a control step of operative control driving of said rotary positioner on a basis of a plurality of temporary servo signals and position said magnetic head on a concentric circle in a center of said spindle motor, before evaluating performance of said temporary servo signals previously written to said magnetic disk,
a measurement step of measuring a displacement of said magnetic head in a seek direction;
a detection step of detecting displacement of a tip of said magnetic head on a basis of said displacement in said seek direction measured by a measurement means for measuring said displacement; and
a determination step of determining whether said temporary servo signals are acceptable, on the basis of said displacement detected by said detection means, whereby a disk evaluation is made speedier and more effective.
13. A magnetic-disk evaluation method according to claim 12, wherein said measurement step further includes a step of detecting said displacement of said magnetic head by irradiating a side of said magnetic head with a plurality of laser beams to receive reflected light therefrom, whereby accuracy of said measurement step is increased.
14. A magnetic-disk evaluation method according to claim 13, wherein said control step further comprises:
a storage step of storing said eccentricity of said magnetic disc measured on said basis of said signal from said magnetic head reading said temporary servo signals while said rotary positioner is fixed;
a cancel step of canceling said eccentricity of said magnetic disk in said signal from said magnetic head by receiving a feed forward input of said eccentricity stored in said storage means; and
a feedback compensating step of generating a signal for feedback-controlling of said rotary positioner, from said signal having said eccentricity canceled at said cancel step.