1. A device for printing a droplet onto a substrate, the device comprising:
a droplet generating member which is needle-shaped and comprises:
a receiving portion disposed vertically to receive a solution; and
a discharge hole connected to the receiving portion and formed on the bottom of the receiving portion so that the solution can be discharged from the receiving portion;
a substrate disposed below the droplet generating member, the substrate includes a target portion to which the droplet discharged from the discharge hole of the droplet generating member is dropped and attached;
a voltage applier which applies a voltage to the droplet so that the droplet can be dropped onto the target portion of the substrate;
a volume measuring unit which measures the volume of the droplet while it hangs from the droplet generating member; and
a droplet control unit which maintains the volume of the droplet at a predetermined level based on the measured volume of the droplet,
wherein the droplet control unit increases or decreases compression in the solution in the receiving portion according to a signal from the volume measuring unit.
2. The device of claim 1, wherein the volume measuring unit comprises:
a light source emitting light onto the droplet;
an image sensor sensing an image of the droplet that is generated by the light emitted from the light source; and
a computer processor receiving data sensed by the image sensor and calculating the volume of the droplet.
3. The device of claim 2, further comprising a divergent lens disposed between the light source and the image sensor.
4. The device of claim 3, wherein the image sensor senses a one-dimensional image of the droplet or a two-dimensional image of the droplet.
5. The device of claim 2, wherein the light source is a laser light source, further comprising a divergent lens that is disposed between the laser light source and the droplet, the divergent lens diverges the laser beam radiated from the laser light source.
6. The device of claim 2, wherein the light source is disposed perpendicularly to a longitudinal direction defining the droplet generating member.
7. The device of claim 1, wherein the light source is disposed above the receiving portion, and the image sensor is disposed below the substrate.
8. The device of claim 1, wherein the droplet control unit includes a pump for compressing or decompressing the solution in the receiving portion.
9. The device of claim 8, wherein the pump is a syringe pump.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A disk drive comprising:
a casing defining a longitudinal axis;
a disk tray disposed within said casing and movable between an extended position, in which, the disk tray extends outwardly from the casing, and a retracted position, in which, the disk tray retracts inwardly into said casing; and
a gear transmission system including
a first gear disposed within said casing,
a gear transmission unit including a second gear and a third gear, rotation of said second and third gears resulting in movement of said disk tray between said extended and retracted positions, and
a driving plate disposed within said casing to extend in a transverse direction relative to said longitudinal axis of said casing, and movable along said transverse direction to left and right sides of said casing, said driving plate having a right serrated portion meshed with said first gear, and a left serrated portion disposed adjacent to and facing said third gear, said driving plate being operably associated with said disk tray in such a manner that said left serrated portion of said driving plate starts to engage with said third gear during inletting of said disk tray to said retracted position so as to be driven by said third gear,
wherein said driving plate further having an open-ended slot formed at the left end of said driving plate and adjacent to said left serrated portion in such a manner to provide resilience when said left serrated portion is engaged with said third gear.
2. The disk drive according to claim 1, wherein said right serrated portion of said driving plate has first and second ends, said first gear having first and second ends respectively meshed with said first and second ends of said first serrated portion of said driving plate when said driving plate is moved to said left and right sides of said casing.
3. The disk drive according to claim 1, wherein said open-ended slot in said left serrated portion is defined by a slot-confining wall having opposite front and rear wall sections and a lateral side wall section interconnecting said front and rear wall sections, said driving plate further including a pair of protrusive stubs respectively fixed to said front and rear wall sections of said slot-confining wall in aligned condition.
4. The disk drive according to claim 3, wherein said driving plate further includes a compression spring that is sleeved on said protrusive stubs and that has two opposite ends respectively connect with said front and rear wall section of said open-ended slot.
5. The disk drive according to claim 4, wherein said compression spring is made from a material group consisting of metal and plastics.
6. A disk drive comprising:
a lower casing half defining a longitudinal axis;
a disk tray disposed within said lower casing half and movable between an extended position, in which said disk tray extends outwardly from said lower casing half, and a retracted position, in which, said disk tray retracts inwardly into said lower casing half; and
a gear transmission system including
a first gear disposed within said lowercasing half,
a gear transmission unit including a second gear and a third gear, rotation of said second and third gears resulting in movement of said disk tray between said extended and retracted positions, and
a driving plate disposed within said lower casing half to extend in a transverse direction relative to said longitudinal axis, and movable along said transverse direction to left and right sides of said lower casing half, said driving plate having a right serrated portion meshed with said first gear, and a left serrated portion disposed adjacent to and facing said third gear, said driving plate being operably associated with said disk tray in such a manner that said left serrated portion of said driving plate starts to engage with said third gear during inletting of said disk tray to said retracted position so as to be driven by said third gear,
wherein said driving plate further having an open-ended slot formed at the left end of said driving plate and adjacent to said left serrated portion in such a manner to provide resilience when said left serrated portion is engaged with said third gear.
7. The disk drive according to claim 6, wherein said right serrated portion of said driving plate has first and second ends, said first gear having first and second ends respectively meshed with said first and second ends of said first serrated portion of said driving plate when said driving plate is moved to said left and right sides of said lower casing half.
8. The disk drive according to claim 6, wherein said open-ended slot in said left serrated portion of said driving plate is defined by a slot-confining wall having opposite front and rear wall sections and a lateral side wall section interconnecting said front and rear wall sections, said driving plate further including a pair of protrusive stubs respectively fixed to said front and rear wall sections of said open-ended slot in aligned condition.
9. The disk drive according to claim 8, wherein said driving plate further includes a compression spring that is sleeved on said protrusive stubs and that has two opposite ends respectively connect with said front and rear wall section of said open-ended slot.
10. The disk drive according to claim 9, wherein said compression spring is made from a material group consisting of metal and plastics.