Optical scanning device

Patent metadata

Field	Value
Publication number	US-10649360-B2
Application number	US-201916386039-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Feb 17, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

In one embodiment, an optical scanning device includes a board and a light receiving member, the positional accuracy of which is improved. When a length in a scanning direction and a length in an intersection direction of a body portion of the light receiving member are denoted by Lx 0 and Ly 0 , respectively, and a length in the scanning direction and a length in the intersection direction of a through-hole formed in the board are denoted by Lx 1 and Ly 1 , respectively, the lengths Lx 0 , Ly 0 , Lx 1 , and Ly 1 satisfy the following formula: (Lx 1 −Lx 0 )>(Ly 1 −Ly 0 ).

First claim

What is claimed is:

1. An optical scanning device comprising:
a light source;
a deflector configured to deflect a light beam emitted from the light source;
a circuit board having a through-hole formed thereon; and
a light receiving member including a light receiving portion and mounted on the circuit board,
wherein the light receiving member receives the light beam that has entered the through-hole while being deflected by the deflector and moving in a scanning direction, and
wherein the light receiving portion is located in a position which is downstream of the center of the light receiving member with respect to the scanning direction and which allows no light beam reflected from an inner wall of the through-hole to be incident on the light receiving portion.

2. The optical scanning device according to claim 1 , wherein, when the light beam deflected by the deflector is viewed from a section taken along the scanning direction, if a point that is located at the most downstream side in the scanning direction and is closest to the deflector on an inner wall of the through-hole is referred to as a reflecting point, a distance between the reflecting point and the light receiving portion with respect to the scanning direction is denoted by D, and a distance between the reflecting point and the light receiving portion with respect to a direction perpendicular to the scanning direction is denoted by t, and an angle of the light beam reflected from the reflecting point with respect to the direction perpendicular to the scanning direction is denoted by θ, the distance D, the distance t, and the angle θ satisfy the following formula:
D>t ·tan θ.

3. The optical scanning device according to claim 1 , wherein the light source is mounted on the circuit board.

4. The optical scanning device according to claim 1 , wherein the light receiving portion outputs a signal based on receiving the light beam, and the light source emits a light beam based on timing at which the signal has been output.

5. The optical scanning device according to claim 1 , wherein the deflector includes a reflecting surface and deflects the light beam by continuously changing a direction in which to reflect the light beam with the reflecting surface, and the light beam reflected from the reflecting surface is incident on the light receiving portion without passing through any lens.

6. The optical scanning device according to claim 1 , wherein the light receiving member is mounted on the circuit board with at least a part of the light receiving member inserted into the through-hole.

7. The optical scanning device according to claim 1 ,
wherein the light receiving member includes terminals for electrical connection to an electrical circuit of the circuit board, and
wherein all of the terminals of the light receiving member are provided along an intersection direction that intersects with the scanning direction.

8. An optical scanning device comprising:
a light source;
a deflector configured to deflect a light beam emitted from the light source;
a circuit board having a through-hole; and
a light receiving member including a light receiving portion and mounted on the circuit board,
wherein the light source is mounted on the circuit board,
wherein the light receiving portion receives a part of the light beam that has entered the through-hole while being deflected by the deflector and moving in a scanning direction, and
wherein another part of the light beam is reflected on a wall of the through-hole.

9. The optical scanning device according to claim 8 ,
wherein the light receiving member includes terminals for electrical connection to an electrical circuit of the circuit board, and
wherein all of the terminals of the light receiving member are provided along an intersection direction that intersects with the scanning direction.

10. An optical scanning device comprising:
a light source;
a deflector configured to deflect a light beam emitted from the light source;
a light receiving member including a light receiving portion; and
a circuit board having a through-hole, a first surface, and a second surface opposite to the first surface,
wherein the light source is mounted on the circuit board,
wherein the light receiving portion receives a part of the light beam that has moved (i) in a direction from the first surface of the circuit board to the second surface of the circuit board (ii) in the through-hole while being deflected by the deflector, and
wherein another part of the light beam is reflected on a wall of the through-hole.

11. The optical scanning device according to claim 10 , wherein, when the light beam deflected by the deflector is viewed from a section taken along the scanning direction, if a point that is located at the most downstream side in the scanning direction and is closest to the deflector on an inner wall of the through-hole is referred to as a reflecting point, a distance between the reflecting point and the light receiving portion with respect to the scanning direction is denoted by D, and a distance between the reflecting point and the light receiving portion with respect to a direction perpendicular to the scanning direction is denoted by t, and an angle of the light beam reflected from the reflecting point with respect to the direction perpendicular to the scanning direction is denoted by θ, the distance D, the distance t, and the angle θ satisfy the following formula:
D>t ·tan θ.

12. The optical scanning device according to claim 10 , wherein the light source is mounted on the circuit board.

13. The optical scanning device according to claim 10 , wherein the light receiving portion outputs a signal based on receiving the light beam, and the light source emits a light beam based on timing at which the signal has been output.

14. The optical scanning device according to claim 10 , wherein the deflector includes a reflecting surface and deflects the light beam by continuously changing a direction in which to reflect the light beam with the reflecting surface, and the light beam reflected from the reflecting surface is incident on the light receiving portion without passing through any lens.

15. The optical scanning device according to claim 10 , wherein the light receiving member is mounted on the circuit board with at least a part of the light receiving member inserted into the through-hole.

16. The optical scanning device according to claim 10 ,
wherein the light receiving member includes terminals for electrical connection to an electrical circuit of the circuit board, and
wherein all of the terminals of the light receiving member are provided along an intersection direction that intersects with the scanning direction.

17. An optical scanning device comprising:
a light source;
a deflector configured to deflect a light beam emitted from the light source;
a circuit board having a through-hole formed thereon; and
a light receiving member including a light receiving portion and mounted on the circuit board,
wherein the light receiving member receives the light beam that has entered the through-hole while being deflected by the deflector and moving in a scanning direction,
wherein the light receiving portion is located downstream of the center of the light receiving member with respect to the scanning direction, and
wherein, in the scanning direction, a gap provided between an inner wall of the through-hole provided at a downstream side of the light receiving member and the light receiving member is larger than a gap provided between an inner wall of t

Assignees

• Canon Kk

Inventors

• Nagatoshi Jun
• Ohta Mitsuhiro
• Tanaka Shunsuke

Classifications

• G02B26/12

  using multifaceted mirrors · CPC title

• G03G15/04036 Primary

  Details of illuminating systems, e.g. lamps, reflectors (lamp housings for copying cameras, reflex exposure lighting G03B27/542) · CPC title

• G03G15/04072 Primary

  by laser · CPC title

• G02B26/10

  Scanning systems · CPC title