Claims
- 1. In an image processing apparatus having generating means for generating a pattern signal having a predetermined period, comparing means for comparing an analog signal with the pattern signal and for generating a pulse width modulated signal, emitting means for emitting a light modulated by the pulse width modulated signal, and supplying means for supplying an image signal to said comparing means as the analog signal during an image forming operation,
- an adjusting method for adjusting a relative relation between the pattern signal and the analog signal, said adjusting method comprising the steps of:
- applying a predetermined level signal to said comparing means as the analog signal;
- detecting an output power (E) of the modulated light emitted from said emitting means when the predetermined level signal is applied to said comparing means; and
- adjusting the relative relation between the pattern signal and the analog signal on the basis of the output power (E) detected in said detecting step so that a difference (.DELTA.V) between a peak level of the pattern signal and the predetermined level signal applied to said comparing means is within a range having a proportional relation to the output power (E) of said emitting means.
- 2. A method according to claim 1, wherein in said adjusting step, a bias of the pattern signal is adjusted.
- 3. A method according to claim 2, further comprising the step of applying a second predetermined level signal to said comparing means as the analog signal and a step of adjusting a dynamic range of the analog signal.
- 4. A method according to claim 1, wherein in said applying step, a predetermined level signal converted from a predetermined digital value by D/A conversion means is applied to said comparing means.
- 5. A method according to claim 1, wherein said method is performed prior to an actual image forming operation.
- 6. A method according to claim 1, wherein said pattern signal is a ramp wave signal.
Priority Claims (1)
Number |
Date |
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Kind |
63-95841 |
Apr 1988 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/078,857 filed Jun. 21, 1993, now abandoned, which was a continuation of application Ser. No. 07/523,831 filed May 16, 1990, now abandoned, which was a continuation of application Ser. No. 07/337,175 filed Apr. 12, 1989, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
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0216462 |
Apr 1987 |
EPX |
0264886 |
Apr 1988 |
EPX |
0271178 |
Jun 1988 |
EPX |
Continuations (3)
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Number |
Date |
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Parent |
78857 |
Jun 1993 |
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Parent |
523831 |
May 1990 |
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Parent |
337175 |
Apr 1989 |
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