1. A projection lens system, in the order from the magnified side to the reduced side thereof, comprising:
a first lens group with a negative refracting power;
a second lens group with a positive refracting power; and
a spatial light modulator;
wherein the projection lens system satisfies the following condition:
3.478<BFLF<3.528;
where BFL is the back focal length of the projection lens system, and F is the effective focal length of the projection lens system.
2. The projection lens system of claim 1, wherein the projection lens system further satisfies the condition: \u22127.3<F1F<\u22126.8, where F1 is the focal length of the first lens group.
3. The projection lens system of claim 1, wherein the first lens group comprises a first lens having a negative refracting power, a second lens having a negative refracting power, a third lens having a negative refracting power, a fourth lens having a positive refracting power, a fifth lens having negative refracting power, a sixth lens having positive refracting power, and a seventh lens having positive refracting power.
4. The projection lens system of claim 3, wherein both the first lens and the fourth lens are made of resin.
5. The projection lens system of claim 3, wherein both the first lens and the fourth lens are aspherical lenses.
6. The projection lens system of claim 3, wherein the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are spherical lenses.
7. The projection lens system of claim 1, wherein the second lens group comprises, in order from the magnified side to the reduced side of the projection lens system, an eighth lens having positive refracting power, a ninth lens having a negative refracting power, a tenth lens having positive refracting power, an eleventh lens having negative refracting power, a twelfth lens having positive refracting power, and a thirteenth lens having positive refracting power.
8. The projection lens system of claim 7, wherein the eighth lens and the ninth lens are attached together to form a single unit, the eleventh lens and the twelfth lens are attached together to form a single unit.
9. The projection lens system of claim 7, wherein the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens are spherical lenses.
10. The projection lens system of claim 7, wherein the thirteenth lens is an aspherical lens.
11. The projection lens system of claim 7, further comprising an aperture stop, wherein the aperture stop is installed between the ninth lens and the tenth lens.
12. The projection lens system of claim 11, wherein the aperture stop is a film of opaque material adhesively positioned on the periphery of a surface of the tenth lens closing to the ninth lens.
13. The projection lens system of claim 1, wherein a focal length of the first lens group is \u221247.11 mm, a focal length of the second lens group is 25.122 mm.
14. The projection lens system of claim 1, wherein a projecting distance of the projection lens system is 1000 mm.
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 terminal assembly for use in transmitting differential signal between two electronic components, comprising:
at least two pairs of conductive, differential signal terminals;
an insulative support formed from a dielectric material and supporting the pairs of terminals in an arrangement where the two differential signal terminal pairs are aligned together in the support, the support having a plurality of distinct sides;
said terminals each including tail portions that are exposed along a first one of the support sides for connection to traces on a circuit board, contact portions that are exposed along a second side of said support sides, body portions interconnecting the tail and contact portions together and defining a signal path through said support, said support including a skeletal framework which spaces terminals of each differential signal pair apart from each other and which aligns said terminals of said differential signal pairs with each other, the skeletal framework including at least one slot disposed in one of said first and second support sides, the slot extending in a preselected distance into said support, said slot partially separating said differential signal terminal pairs from each other within said support, said skeletal framework including a plurality of openings defined therein that expose portions of said terminal body portions, the openings being aligned with said terminal body portions in a path between said terminal tail and contact portions, said first and second sides of said support being spaced apart from each other and extending parallel to each other, said terminal body portions extending linearly within said support between said terminal tail and contact portions.
2. (canceled)
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16. A terminal assembly for insertion into a differential signal connector, the connector housing including a plurality of terminal-receiving passages disposed therein, the terminal assembly comprising:
a plurality of conductive terminals, the terminals being arranged in a vertical column having at least two rows of terminals, each terminal row including a differential signal terminal pair, the terminals of each terminal pair being spaced apart from each other and said terminal pairs being spaced apart from each other;
each of the terminals having a tail portion for terminating to a circuit board, a contact portion for mating with an opposing terminal of an opposing connector and a body portion interconnecting the tail and contact portions together, each of said terminals following a distinct path between said tail and contact portions; and
an insulative support frame that supports said terminals in said column and row arrangement, the support frame having a body portion defined by a plurality of distinct sides, said terminal contact portions extending outwardly along a first side of said support frame, said terminal tail portions extending outwardly along a second side of said support frame, the support frame having plurality of slots disposed therein that extend inwardly from said support first and second sides, parallel to said terminal contact and tail portions, said slots extending between adjacent terminal pairs and receiving portions of the connector housing therein when said terminal assembly is inserted into said connector housing.
17. The terminal assembly of claim 16, wherein said support frame is formed from a dielectric material and wherein said terminals are partially encapsulated within said support frame, and said support frame has a plurality of openings disposed therein which expose portions of said terminal body portions to the exterior.
18. The terminal assembly of claim 17, wherein said openings are disposed on opposite sides of said support frame.
19. The terminal assembly of claim 17, wherein said support frame includes two interengaging support frame halves, each of the support frame halves containing a single column of terminals.
20. The terminal assembly of claim 16, wherein said tail portions include compliant pins of the eye-of-needle style.
21. The terminal assembly of claim 20, wherein said contact portions also include compliant pins of the eye-of-needle style.
22. The terminal assembly of claim 19, wherein said support frame includes at least one interior web portion that separates said differential signal terminal pairs from each other, each of said support frame halves including half web portions that include a means for joining said half web portions together to form said support web portion.
23. The terminal assembly of claim 22, wherein said half web portion joining means includes complimentary shaped post and recesses.