JPS6085672A - optical reader - Google Patents

Abstract

PURPOSE:To avoid the trouble of a sensor at the time of focusing greatly and to observe the change of signals easily by installing lighting equipment which irradiates an image sensor in a unit which regenerates the light signal expressed as a dense or light picture in accordance with strength of the electric signal. CONSTITUTION:For focusing of an image sensor 11, the switch (not shown in the drawing) which lights up a pilot lamp 14, is turned ON. The pilot lamp 14 lights up, light emitted from the pilot lamp 14 is reflected by the image sensor 11, and the light enters a dichromic mirror 10. The light passes a lens 9 through, it is reflected by reflectors 8 and 7 in order, and it reaches a manuscript stand glass 5. While the light is enlarged by a magnifying lens 20, the image sensor 11 is moved along the optical axis, and focusing is executed at the location where the surface image of the image sensor 11 is clear. In the same way, focusing is also executed for image sensors 12 and 13. Pilot lamps 14, 15 and 16 can be separately disconnected by the switch which is not shown in the drawing.

Description

[Detailed description of the invention] The present invention relates to an optical reader.

For example, the optical section of a digital copying machine is as shown in FIG. 1, which is a side view. The light emitted from the exposure lamps l, - is reflected by the reflective shade 3. The light reflected by the mirror passes through the document table glass 5 and illuminates the document 6. The reflecting mirror 7 includes exposure lamps l, ko and a reflecting shade 3. 'I and original platen glass 5
The reflecting mirror g moves along the document table glass 5 in the same direction as the reflecting mirror 7 at half the speed of the reflecting mirror 7, and the light reflected by the document 6 changes depending on the density of the document A. The light is converted into weak and strong light, passes through a reflecting mirror 7°S lens de, enters a dichroic mirror lθ, and is separated into three colors: blue 31, green G, and R, each of which is sent to an image sensor (
B)//, image sensor (G)/j, image sensor (R)/, 7. Images are reproduced according to the output voltages of these three image sensors.

/2. Image sensor-II, /:1. so that the reflected light from the original is focused on /J. ．． 13 must be installed/installed by adjusting the position.

This focus adjustment is done by the image sensor -//, /J.

Place the magnifying glass θ on the document table glass j while shining a flashlight onto the surface of the image sensor -//, /2. /3
The flashlight is fixed in a position where the surface of the element can be clearly seen, but it is extremely difficult to illuminate the image sensor (R)/j, which is attached to the bottom and generates G, because the flashlight must be placed inside the narrow optical section. , three image sensors-//, It
, /3 required a lot of time to adjust the focus.

The present invention has been made to solve the above-mentioned drawbacks, and it makes it easy to adjust the focus of the three image sensors and also makes it easy to check the electrical signals that change when light enters the image sensors. The purpose of this invention is to provide an optical reading device for a digital copying machine.

The present invention is an apparatus that converts an optical signal into an electrical signal and reproduces the density of an image according to the strength of the electrical signal, which is equipped with a lighting fixture for illuminating an image sensor.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a side view. Components having the same functions as those in FIG. 1 are given the same reference numerals to avoid duplication of detailed explanation. ip, is
, it is a miniature light bulb, and the image sensor is −// , /, 2
,/,? It is fixed to the machine frame so that it irradiates the light. /7.
/za, /9 is a miniature light bulb /'I, /A;.

This is a reflective shade to prevent the light from reaching the dichroic mirror 10 directly from the dichroic mirror 10. First, the image sensor (B
)// can be adjusted by turning on the switch (not shown) that turns on the miniature light bulb /4, and the light emitted from the miniature light bulb /4 is reflected by the image sensor -//. The light enters the dichroic mirror IO, passes through the lens 9, is sequentially reflected by the reflecting mirrors g and 7, and reaches the document platen glass S. This light is transmitted to the magnifying glass 2.
Image sensor while zooming in at 0 (B) / /
is moved along the optical axis to adjust the focus to a position where the surface image of the image sensor (B) is clear. Similarly, image sensor (G)/2, image sensor (R
)/3 as well.

Small light bulb /Q, /! ; and /A can be connected and disconnected separately using switches not shown.

The object that illuminates the image sensor -//, /2, 1.3 is a miniature light bulb /'I, /! , //, but may be a light emitting diode, for example. Also, place the light bulb in a remote location and image sensor-/1. , /3. /'I may be guided through a glass fiber tube (not shown). The miniature light bulb may be placed on the substrate with the image sensor attached, or may be attached to a member in the optical section around it.

As explained above, in a device that converts an optical signal into an electrical signal and reproduces it as a gray scale image depending on the strength of the electrical signal, by attaching a lighting device that illuminates the image sensor, the focal point of the image sensor can be This has the effect of greatly saving time and effort during adjustment, and making it possible to easily observe changes in signals by blinking the lighting equipment when inspecting the image signal processing circuit.

[Brief explanation of drawings]

FIG. 7 is a side view of the conventional example, and FIG. 2 is a side view of the embodiment of the present invention. S...Original table glass 1g...Reflector 9.Fist lens 10...Dichroic mirror //. lko, /3...Image sensor -lg, /! ,/A...
Small light bulb /7,1g, /9@・Reflective shade SO・・Magnifying glass. Patent applicant: Canon Co., Ltd. Representative: Arai-be

Claims (1)

[Claims] 1. An optical reading device that converts an optical signal into an electrical signal and reproduces the density of an image depending on the strength of the electrical signal, which is characterized by being equipped with a lighting device that illuminates an image sensor.