Exposure lamp control device

• US 3,898,006 A
• Filed: 08/27/1974
• Issued: 08/05/1975
• Est. Priority Date: 09/03/1973
• Status: Expired due to Term

• Current Assignee: Hisashi Sakamaki, Toshio Honma, Yoshimasa Kimura
• Original Assignee: Hisashi Sakamaki, Toshio Honma, Yoshimasa Kimura
• Inventors: Kimura, Yoshimasa, Sakamaki, Hisashi, Honma, Toshio
• Primary Examiner(s): Wintercorn, Richard A.
• Application Number:
  US05/501,090
• Time in Patent Office: 343 Days
• Field of Search: 355/69,4 314/135 315/246,289
• US Class Current: 355/69
• CPC Class Codes: G03B 27/73 Controlling exposure by variation of spectral composition, e.g. multicolor printers
• CPC Class Codes: G03B 27/80 in dependence upon automatic analysis of the original G03B27/73 takes precedence
• CPC Class Codes: G03G 15/011 for exposing

Abstract

A device for controlling an exposure lamp for projecting an original image by changing pulse repetition rate or pulse width which activates the lamp. There are included a pulse oscillator, a pulse width controlling circuit, and a switching circuit. The pulse oscillator includes a plurality of pulse repetition rate setting circuits corresponding to the number of desired color separations. The pulse width controlling circuit includes a plurality of pulse width setting circuits corresponding to the number of desired color separations. The pulse repetition rate of the pulse oscillator or the pulse width of the pulse controlling circuit may be set to a desired value depending upon a desired separation negative.

Claims

1. A device for controlling an exposure lamp for exposing or projecting an original image comprising:

a. a pulse oscillator means whose pulse repetition rate is variable, b. a pulse width conversion or changing means for changing the pulse width of the output pulses of said pulse oscillator means, and c. a switching means adapted to be turned on and off in response to the output pulses from said pulse width conversion or changing means.

2. In an exposure and projection system including color separating means for exposIng and projecting an original image in different colors, an exposure lamp control device comprising:

a. means for switching said color separating means depending upon a desired separation negative, b. pulse oscillator means comprising means for adjusting pulse repetition rate thereof to a desired value, c. pulse width conversion or changing means comprising means for adjusting the output pulse width thereof to a desired value in accordance with the pulse width of the output pulses from said pulse oscillator means, and d. switching means adapted to be turned on and off in response to the output pulses from said pulse width conversion or changing means, thereby controlling the on-off operation of an exposure lamp or lamps,

3. A device as defined in claim 2 wherein said pulse oscillator or generator means includes:

a. a plurality of pulse repetition rate setting means corresponding to the number of desired separations for setting a pulse repetition rate depending upon a desired separation negative, b. means for selecting and switching said pulse repetition rate setting means, and c. means for operatively interconnecting said selecting and switching means and means for switching said color separating means depending upon a desired separation negative.

4. A device as defined in claim 2 wherein said pulse width conversion or changing means includes:

a. a plurality of pulse width setting means corresponding to the number of desired separations for setting a pulse width depending upon a desired separation negative, b. means for selecting and switching said pulse width setting means, and c. means for operatively interconnecting said selecting and switching means and means for switching said color separating means depending upon a desired separation negative.