Optical system having cemented lens including negative lens, image pickup apparatus, in-vehicle system, and moving apparatus
An optical system includes a diaphragm, and a first cemented lens disposed adjacent to an object side of the diaphragm. The first cemented lens included a negative lens. A predetermined condition is satisfied.
1. An optical system comprising:
a diaphragm; and
a first cemented lens disposed adjacent to an object side of the diaphragm,
wherein the first cemented lens includes a negative lens, and
wherein the following inequality is satisfied:
1.5< D 1/ D 0<15.0
where D 0 is an effective diameter of the negative lens, and D 1 is an outer diameter of the negative lens.
2. The optical system according to claim 1 , wherein the first cemented lens consists of two or three lenses.
3. The optical system according to claim 1 , wherein the first cemented lens has a negative refractive power.
4. The optical system according to claim 1 , further comprising a second cemented lens disposed adjacent to an image side of the diaphragm.
5. The optical system according to claim 4 , wherein the second cemented lens includes a negative lens, and
wherein the negative lens of the second cemented lens satisfies the inequality.
6. The optical system according to claim 4 , wherein the second cemented lens consists of two or three lenses.
7. The optical system according to claim 4 , wherein the second cemented lens has a positive refractive power.
8. The optical system according to claim 1 , wherein the negative lens is a negative lens having the smallest effective diameter among negative lenses constituting the optical system.
9. The optical system according to claim 1 , wherein the following inequality is satisfied:
1.05≤ D 2max/ D 1≤1.30
where D 2 max is an outer diameter of a lens having the largest outer diameter among lenses constituting the optical system.
10. The optical system according to claim 1 , wherein the following inequality is satisfied:
0.80≤ D max/ D 1≤1.20
where Dmax is an effective diameter of a lens with the largest outer diameter among lenses constituting the optical system.
11. An image pickup apparatus comprising:
the optical system accordingly to claim 1 ; and
an image sensor configured to capture an object via the optical system.
12. An in-vehicle system comprising:
the image pickup apparatus according to claim 11 ; and
a processor configured to determine a likelihood of collision between a vehicle and an object based on distance information on the object acquired by the image pickup apparatus.
13. A moving apparatus comprising the image pickup apparatus according to claim 11 ,
wherein the moving apparatus can be moved while holding the image pickup apparatus.