USRE44773EExpiredUtility
Optical imaging system
Est. expiryJul 7, 2025(expired)· nominal 20-yr term from priority
G02B 5/20G03B 30/00G02B 13/18G02B 13/004G02B 9/34G02B 9/36
46
PatentIndex Score
0
Cited by
16
References
33
Claims
Abstract
An optical imaging system is provided comprising a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive or negative power; and a fourth lens group having a positive or negative power.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power closest to a subject an object;
a second lens group closest to the first lens group and having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power,
wherein the first lens group comprises an aspheric lens having both surfaces aspheric and each of the first second to fourth lens groups comprises an aspheric lens having at least one aspheric surface thereof; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups,
wherein a first lens of the first lens group has an object side surface having a positive curvature, and a second lens of the second lens group has an image side surface having a positive curvature and a third lens of the third lens group has an object side surface having a negative curvature and an image side surface having a negative curvature.
2. An The optical imaging system according to claim 1 , wherein the first lens group comprises at least one lens of a positive refractive power.
3. An The optical imaging system according to claim 1 , wherein the second lens group comprises at least one lens of a negative refractive power.
4. An The optical imaging system according to claim 1 , wherein the third lens group comprises at least one lens of a positive or negative refractive power.
5. An The optical imaging system according to claim 1 , wherein a fourth lens group comprises at least one lens of a positive or negative refractive power.
6. An The optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.3
<
f
1
f
<
3.1
,
wherein f denotes synthetic focus distance total focal length of the optical imaging system and f 1 denotes focus distance focal length of the first lens group.
7. An The optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.3
<
f
2
f
<
8.99
,
wherein f denotes a synthetic focus distance total focal length of the optical imaging system and f 2 denotes a focus distance focal length of the second lens group.
8. An The optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.19
<
f
3
f
<
∞
,
[
0.19
<
f
3
f
<
∞
]
wherein f denotes a synthetic focus distance total focal length of the optical imaging system and f 3 denotes a focus distance focal length of the third lens group.
9. An The optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.15
<
f
4
f
<
∞
,
wherein f denotes a synthetic focus distance total focal length of the optical imaging system and f 4 denotes a focus distance focal length of the second lens group.
10. An The optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power, according to claim 1, wherein the optical imaging system satisfies
0.45
<
f
TTL
<
1.01
,
wherein f denotes a synthetic focus distance total focal length of die the optical imaging system and TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
11. An The optical imaging system according to claim 10 , further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.
12. An The optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power, according to claim 1, wherein the first and second lens groups satisfy an optical axis direction size according to
0
<
d
1
TTL
<
0.26
,
wherein d 1 denotes a separated distance between the first lens group and the second lens group on the optical axis and TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
13. An The optical imaging system according to claim 12 , further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.
14. An The optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power, according to claim 1, wherein the third and fourth lens groups satisfy an optical axis direction size according to
0
<
d
3
TTL
<
0.40
,
wherein d 3 denotes a separated distance between the third lens group and the fourth lens group on the optical axis and TIL TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
15. An The optical imaging system according to claim 14 , further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.
16. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power closest to a subject; a second lens group closest to the first lens group and having a negative refractive power; a third lens group having one of a positive or negative power; and a fourth lens group having one of a positive or negative power, wherein each of the first to fourth lens groups comprises an aspheric lens having at least one aspheric surface thereof, and wherein the Abbe's numbers of the first and second lens groups G 1 and G 2 satisfy
28.2<ν1−ν2<42.8,
wherein ν 1 and ν 2 denote Abbe's numbers representing the distribution characteristics of the first and second lens groups respectively.
17. The optical imaging system according to claim 10, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light is between the second and third lens groups.
18. The optical imaging system according to claim 10, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the third and the fourth lens groups.
19. The optical imaging system according to claim 12, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light is between the second and third lens groups.
20. The optical imaging system according to claim 12, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the third and the fourth lens groups.
21. The optical imaging system according to claim 14, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light is between the second and third lens groups.
22. The optical imaging system according to claim 14, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the third and the fourth lens groups.
23. The optical imaging system according to claim 1, wherein the fourth lens group comprises an aspheric lens having both surfaces aspheric.
24. The optical imaging system according to claim 1, wherein the third lens group has a positive power and the fourth lens group has a negative power.
25. The optical imaging system according to claim 1, wherein the third lens group has a negative power and the fourth lens group has a negative power.
26. The optical imaging system according to claim 1, wherein the third lens group has a positive power and the fourth lens group has a positive power.
27. The optical imaging system according to claim 1, wherein the third lens group has a negative power and the fourth lens group has a positive power.
28. The optical imaging system according to claim 1, further comprising an iris disposed at an object side of the first lens.
29. The optical imaging system according to claim 1, wherein a fourth lens of the fourth lens group comprises an image side surface having a positive curvature.
30. The optical imaging system according to claim 29, wherein a sign of curvature is changed when the image side surface of the fourth lens is distant from an optical axis.
31. The optical imaging system according to claim 1, wherein a sign of a curvature is changed when an image side surface of a fourth lens of the fourth lens group is distant from an optical axis.
32. The optical imaging system according to claim 1, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light is between the second and third lens groups.
33. The optical imaging system according to claim 1, further comprising one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the third and the fourth lens groups.Cited by (0)
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