Optical beam control device and image-forming device including the same
First Claim
Patent Images
1. An optical beam control device comprising:
- a light-emission unit that emits an optical beam;
a scanning unit that causes the optical beam to scan on an image bearing member;
a luminous energy detection unit that detects luminous energy of the optical beam emitted by the light-emission unit;
an optical beam detection unit that detects that the optical beam having a predetermined amount of luminous energy scans on a predetermined position; and
a control unit that controls a light-emission timing at which the light-emission unit emits the optical beam, the control unit controlling the luminous energy of the optical beam emitted by the beam emission unit in response to the detected luminous energy;
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wherein the control unit increases the luminous energy gradually in an initial period from an activation of the light-emission unit to a first detection of the optical beam by the optical beam detection unit;
the initial period has an extinction period; and
the control unit controls the light-emission unit to extinguish the optical beam during the extinction period.
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Abstract
An optical beam control device that can suppress deterioration of a laser diode and a photosensitive member is disclosed. Control is performed in such a manner that the luminous energy of emitted light is increased gradually in an initial period from the activation of a laser diode until the first generation of a BD detection signal. The initial period includes an extinction period in which the laser beam is extinguished. Therefore, deterioration of the light-emitting portion of the laser diode and the photosensitive member can be suppressed.
9 Citations
12 Claims
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1. An optical beam control device comprising:
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a light-emission unit that emits an optical beam;
a scanning unit that causes the optical beam to scan on an image bearing member;
a luminous energy detection unit that detects luminous energy of the optical beam emitted by the light-emission unit;
an optical beam detection unit that detects that the optical beam having a predetermined amount of luminous energy scans on a predetermined position; and
a control unit that controls a light-emission timing at which the light-emission unit emits the optical beam, the control unit controlling the luminous energy of the optical beam emitted by the beam emission unit in response to the detected luminous energy;
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whereinthe control unit increases the luminous energy gradually in an initial period from an activation of the light-emission unit to a first detection of the optical beam by the optical beam detection unit;
the initial period has an extinction period; and
the control unit controls the light-emission unit to extinguish the optical beam during the extinction period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image-forming device comprising:
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a light-emission unit that emits an optical beam;
an image bearing member that is exposed by the optical beam to form a latent image thereon;
a scanning unit that causes the optical beam to scan on the image bearing member;
a luminous energy detection unit that detects luminous energy of the optical beam emitted by the light-emission unit;
an optical beam detection unit that detects that the optical beam having a predetermined amount of luminous energy scans on a predetermined position; and
a control unit that controls a light-emission timing at which the light-emission unit emits the optical beam, the control unit controlling the luminous energy of the optical beam emitted by the beam emission unit in response to the detected luminous energy;
whereinthe control unit increases the luminous energy gradually in an initial period from an activation of the light-emission unit to a first detection of the optical beam by the optical beam detection unit;
the initial period has an extinction period; and
the control unit controls the light-emission unit to extinguish the optical beam during the extinction period. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification