Optical scanning device
AssigneeCanon Kabushiki Kaisha
InventorsJun Nagatoshi, Mitsuhiro Ohta, Shunsuke Tanaka
Life of this patent
Estimating the term…
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 Lx0 and Ly0, 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 Lx1 and Ly1, respectively, the lengths Lx0, Ly0, Lx1, and Ly1 satisfy the following formula: (Lx1−Lx0)>(Ly1−Ly0).
Claims20
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.
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.
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.
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 the through-hole provided at an upstream side of the light receiving member and the light receiving member.
Dependencies are inferred from the claim text.