1. A zoom lens system comprising a plurality of lens units each being composed of at least one lens element,
the zoom lens system, in order from an object side to an image side, comprising:
a first lens unit having positive optical power;
a second lens unit having negative optical power;
a third lens unit having positive optical power;
a fourth lens unit having positive optical power; and
a fifth lens unit having negative optical power, wherein
the first lens unit is composed of two or less lens elements,
the third lens unit is composed of five or more lens elements, and
the following condition (1) is satisfied:
5.0<f1f3<8.0\u2003\u2003(1)
where
f1 is a focal length of the first lens unit, and
f3 is a focal length of the third lens unit.
2. The zoom lens system as claimed in claim 1, wherein the following condition (2) is satisfied:
1.0<D3D1<10.0\u2003\u2003(2)
where
D1 is an optical axial thickness of the first lens unit, and
D3 is an optical axial thickness of the third lens unit.
3. The zoom lens system as claimed in claim 1, wherein the following condition (3) is satisfied:
\u221215.0<f5fW<\u22123.0\u2003\u2003(3)
where
f5 is a focal length of the fifth lens unit, and
fW is a focal length of the zoom lens system at a wide-angle limit.
4. An imaging device capable of outputting an optical image of an object as an electric image signal, comprising:
a zoom lens system that forms the optical image of the object; and
an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system is the zoom lens system as claimed in claim 1.
5. A camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising:
an imaging device including a zoom lens system that forms the optical image of the object, and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system is the zoom lens system as claimed in claim 1.
6. A zoom lens system comprising a plurality of lens units each being composed of at least one lens element,
the zoom lens system, in order from an object side to an image side, comprising:
a first lens unit having positive optical power;
a second lens unit having negative optical power;
a third lens unit having positive optical power;
a fourth lens unit having positive optical power; and
a fifth lens unit having negative optical power, wherein
the first lens unit is composed of two or less lens elements,
the third lens unit is composed of at least two lens elements, and an aperture diaphragm is placed between two lens elements among the lens elements constituting the third lens unit, and
the following condition (1) is satisfied:
5.0<f1f3<8.0\u2003\u2003(1)
where
f1 is a focal length of the first lens unit, and
f3 is a focal length of the third lens unit.
7. The zoom lens system as claimed in claim 6, wherein
the third lens unit is composed of five or more lens elements.
8. The zoom lens system as claimed in claim 6, wherein the following condition (2) is satisfied:
1.0<D3D1<10.0\u2003\u2003(2)
where
D1 is an optical axial thickness of the first lens unit, and
D3 is an optical axial thickness of the third lens unit.
9. The zoom lens system as claimed in claim 6, wherein the following condition (3) is satisfied:
\u221215.0<f5fW<\u22123.0\u2003\u2003(3)
where
f5 is a focal length of the fifth lens unit, and
fW is a focal length of the zoom lens system at a wide-angle limit.
10. An imaging device capable of outputting an optical image of an object as an electric image signal, comprising:
a zoom lens system that forms the optical image of the object; and
an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system is the zoom lens system as claimed in claim 6.
11. A camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising:
an imaging device including a zoom lens system that forms the optical image of the object, and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system is the zoom lens system as claimed in claim 6.
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 modular laser assembly comprising:
a laser-fiber housing comprising a semiconductor laser optically coupled to an end of an optical fiber, the laser-fiber housing having electrical leads electrically coupled to the laser and extending from a front face of the laser-fiber housing, wherein the laser-fiber housing is compatible for mounting onto a mating section of a circuit board but is not compatible for mounting onto a mating section of a circuit board designed to mate with a butterfly package housing and wherein the laser-fiber housing is substantially cylindrical;
a mounting platform comprising laser interfacing circuitry and contacts electrically coupled thereto, said mounting platform defining a slot for receiving the laser-fiber housing such that a portion of the laser-fiber housing extends to one side of the mounting platform and a portion of the laser-fiber housing extends to an opposite side of the mounting platform, wherein when said laser-fiber housing is mounted to the mounting platform the electrical leads are proximate and capable of being electrically coupled to the contacts on at least a first surface of the mounting platform, and a plurality of pins electrically coupled to said interfacing circuitry and extending laterally from opposing sides of the mounting platform;
a temperature-controlling element for coupling to and controlling the temperature of the laser-fiber housing, wherein the temperature-controlling element is configured to be mounted to the laser-fiber housing such that the temperature-controlling element is substantially parallel to and adjacent a second surface of the mounting platform, and wherein the temperature-controlling element includes electrical leads capable of being electrically coupled to contacts on the second surface of the mounting platform; and
wherein the dimensions of the mounting platform and the orientation, number, and dimension of the pins extending therefrom, and the dimensions of the laser-fiber housing and the temperature-controlling element are such that the modular laser assembly is compatible for mounting onto a mating section of a circuit board designed to mate with a butterfly package housing.
2. The modular laser assembly of claim 1, wherein the laser-fiber housing is a TO can housing.
3. The modular laser assembly of claim 1, wherein the interfacing circuitry further comprises drive circuitry.
4. The modular laser assembly of claim 1, wherein the pins comprise two parallel sets of seven pins.
5. The modular laser assembly of claim 4, wherein the pins are each approximately 13 mm long and approximately 0.5 mm wide, wherein the pins of each parallel set of seven pins are spaced about 2.5 mm apart.
6. The modular laser assembly of claim 5, wherein the mounting platform is approximately 21 mm long and approximately 13 mm wide.
7. The modular laser assembly of claim 1, wherein the temperature-controlling element is a thermo-electric cooler (TEC).
8. The modular laser assembly of claim 1, wherein: the interfacing circuitry is disposed on the surface of the mounting platform; the laser-fiber housing is substantially cylindrical; and the first and second surfaces are parallel to the pins and the pins extend from opposing end surfaces of the mounting platform that are perpendicular to the first and second surfaces and substantially parallel to the axis of the laser-fiber housing.