Method and apparatus for adjusting an apparatus using light source and recording apparatus adjusted thereby

An adjusting method for adjusting an objective apparatus, the objective apparatus having a light emitting device, an electrical resistance device comprising a trimmable resistor, and controlling means for controlling the light emitting device to emit a light in a period corresponding to a value of input data, said adjusting method comprising the steps of:

• a setting step of setting the controlling means of the objective apparatus in a predetermined enabling state in which the light emitting device successively emits a light in a period corresponding to a predetermined value;
• a detection step for detecting a light emission intensity of the light emitting device;
• and
• an adjusting step of adjusting a resistance of the electrical resistance device by trimming the trimmable resistor in accordance with the light emission intensity of the light emitting device detected in said detecting step.

An apparatus for adjusting a recording apparatus, said recording apparatus including a light source and control means including a trimmable resistance device for driving the light source for a time corresponding to a digital value representing a density level, said apparatus comprising:

• detecting means for detecting a light from the light source at a relative position at which a member to be illuminated of the recording apparatus is to be positioned;
• setting means for setting the control means of the recording apparatus in a predetermined enabling state in which the light source successively emits a light in a period corresponding to the predetermined digital value;
• and
• adjusting means for adjusting a resistance of the trimmable resistance device provided in said control means periodically for a time determined by said predetermined digital value in accordance with an output of said detecting means in an activated state of said light source.

A method for adjusting a recording apparatus, said recording apparatus including a light source and control means including a trimmable resistance device for driving the light source for a time corresponding to a digital value representing a density level, said method comprising the steps of:

• a setting step of setting the control means of the recording apparatus in a predetermined enabling state in which the light source successively emits a light in a period corresponding to the predetermined digital value;
• a detecting step of detecting a light from the light source at a position at which a member to be illuminated of the recording apparatus is to be positioned while said light source is driven periodically for a time corresponding to said predetermined digital value;
• and
• an adjusting step of adjusting a resistance of the trimmable resistance device provided in said control means periodically for a time determined by said predetermined digital value in accordance with detection in said detecting step.

A recording apparatus having a light source, said recording apparatus comprising:

• detection means for detecting an intensity of the light emitted by the light source;
• first control means for controlling the intensity of the light emitted by the light source in accordance with the light intensity detected by said detection means;
• second control means for causing said light source to emit a light for a light emission time determined by a digital value;
• and
• a trimmable resistance device trimmable by a laser beam,
• wherein the light emission time of said light source is dependent upon a resistance of said trimmable resistance device.