JPS6017701A - Optical device - Google Patents

Abstract

PURPOSE:To improve remarkably the reflecting efficiency of a reflector and to prevent the temp. of a body to be irradiated from rising by coating the reflecting surface of the reflector with a highly reflecting layer. CONSTITUTION:The inside of a reflector 6 confronting a lamp 5 for exposure is a reflecting surface 6a for reflecting light from the lamp 5 toward an original. The surface 6a is coated with an SiO layer 12 as a highly reflecting layer. The light reflecting efficiency is improved, and the quantity of light irradiated on the original can be increased without increasing the illuminance of the lamp 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an optical device included in, for example, an electronic copying machine.

[Technical background of the invention and its problems]

This type of optical device irradiates the original with light from an exposure rung directly and by reflecting the light from the reflective surface of a reflector, and the reflected light from the original is passed through a mirror, an optical lens, a slit, etc., and then exposed to light. is guided to the surface of the body drum to form an image.

By the way, in the past, the reflective surface of the reflector was
After electrical polishing, alumite treatment was applied to protect the surface.

However, when the alumite treatment is performed, the surface reflectance is 75% (550 nm), and after electrolytic polishing the reflectance is 75% (550 nm).
There was a drawback that it was lower than 8% (550 nm). For this reason, it is necessary to increase the rated power of the exposure lamp, resulting in a waste of energy and an increase in the temperature of the document surface.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an optical device that can improve the reflection efficiency of a reflecting surface of a reflector that reflects light from a light source.

[Summary of the invention]

In order to achieve all of the above objects, the present invention coats the reflective surface of a reflector that reflects light from a light source with a highly reflective layer.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. In the figure, reference numeral 1 denotes a main body of an electronic copying machine, and a document table (transparent glass plate) 2 on which a document is placed is provided on the upper surface of the main body 1. The document placed on the document table 2 is held down by a document presser 3. In addition, the main body 1
An exposure system 4 is provided at the inner upper portion facing the lower surface side of the document table 2. As shown in FIG. This exposure system 4 includes an exposure lamp ``5'' as a light source, a glue deflector 6 as a reflector, and a mirror 7.8.
．． 9. Lens 10z Consists of a mirror 1 and a slit 21.

The exposure lamp "5" and the mirror 7 and the mirrors 8 and 9
are separately reciprocated in the direction of the arrow by a drive mechanism (not shown), and at this time, mirror 7 is moved at a speed of V2 of mirrors 8 and 9 in order to keep the optical path length constant. It has become.

On the other hand, the above-mentioned 7 rector 6 is constructed as shown in FIG. 2, and the inner peripheral surface facing away from the exposure run f5 is
For example, 5. The f-t method and the kawari method were adopted, and the reflectance (
500 nm) is approximately 85 mm for the jet type and approximately 72 mm for the circular type.

During image exposure, the exposure lamp 5 is turned on and travels, and the light from the exposure lamp 5 is reflected directly and by the reflective surface 6a of the reflector 6 to illuminate the original A and scan it. And is the reflected light from document A a mirror? , 8.
9 and then reflected by the mirror 1 via the lens 10.
1 and guided onto the photoreceptor drum 22 via the slit 21, where an original image is formed (slit exposure).

As mentioned above, the reflective surface 6Q of the reflector 6 has 810
Since the layer 12 is coated, the light reflection efficiency is improved,
l without increasing the brightness of the exposure lamp 5! This means that the amount of light irradiated to the TR can be increased.

The reflective surface 6a of the reflector 6 may be coated with a multilayer film. The reflectance in this case is about 72
% (500 nm).

〔Effect of the invention〕

As explained above, the present invention reflects light from a light source by the reflective surface of a reflector and irradiates the irradiated object with the light, in which the reflective surface of the reflector is coated with a highly reflective layer. The reflection efficiency is significantly improved. Therefore, it is possible to obtain sufficient light II± without increasing the brightness of the light dθ as in the past, which is economical and also prevents the temperature rise of the irradiated object, making it safe. It is.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram showing an image exposure system in an electronic copying machine, and FIG. 2 is a side sectional view showing an enlarged reflector thereof. 5... Light source (exposure lamp''), 6... Reflector (reflector), 2... Irradiated object, 12... Highly reflective layer (
(Si2 layer). Applicant's agent Patent attorney Takehiko Suzue 2 Name of the invention Optical device 3 Relationship to the case of the person making the amendment Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4 Agent 6 Number of columns of amendment 7 Contents of amendment (1) The entire specification is corrected as shown in the attached sheet. (2) Add Figure 3 shown in Attachment f2 to the drawings. Description 1, Title of the invention Optical device 2, Claims (1) In the device C2 that reflects the light from the light source by the reflective surface C2 of the reflector and irradiates the irradiated object with the light, An optical device characterized by coating a reflective surface of a reflector with a highly reflective layer. (2) The optical device according to claim 1, wherein the high fouling layer is a Si0 layer. (3) The optical device according to claim 1, wherein the high reflection layer is a multilayer film. (4) The reflector is composed of a plurality of divided pieces,
3. The optical device according to claim 1 or 2, wherein each divided piece is coated with two highly reflective layers. 3. Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a wax lifting device provided in, for example, an electronic copying machine. [Technical background of the invention and its problems] This type of optical device irradiates the original with light from an exposure lamp directly and by reflecting the light from the reflective surface of a glue flap as a reflector, and uses the reflected light from the original. The surface of the photoreceptor drum (
It is designed to be used twice to form images. Incidentally, the reflective surface of the reflector has conventionally been subjected to alumite treatment after electrolytic polishing to protect the surface. However, when alumite treatment is applied, the surface reflectance is 75% (550 nm), and after electrolytic polishing, the reflectance of the surface is 75% (550 nm).
There was a drawback that the wavelength was lower than that of 8mm (550nm). For this reason, it is necessary to increase the rated power of the exposure lamp, resulting in a waste of energy and an increase in the temperature of the document surface. [Object of the Invention] The present invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an optical device that can improve the reflection efficiency of the reflection surface of a reflector that reflects light from a light source. That is. [Summary of the Invention] In order to achieve the above object, the present invention is a reflector coated with a reflective layer that reflects light from a light source. [Embodiment J of the Invention] The present invention will be described below with reference to an illustrated embodiment. In the figure, 1 is a main body of an electronic copying machine, and a document is placed on the upper surface of the main body 1. A document table (transparent glass plate) 2 is provided. A manuscript placed on the document table 2 is held down by a document presser 3. Also, on the top of the main body 1, An exposure system 4 is provided opposite the lower surface side of the document table 2. This exposure system 4 includes a light source (-exposure) t rande 5, a glue deflector 6 as a reflector, and a mirror 7.8. , 9, a lens 10, a mirror 11, and a slit 21. At this time, the mirror 7 moves at a speed % of that of the mirrors 8 and 9 because the optical path length is constant l:''f. 10, The reflector 6 has a ζ2 structure as shown in FIG. 2, and the inner peripheral surface facing away from the exposure lamp 5 serves as a reflection surface 6a that reflects the light from the exposure lamp 5 toward the original. There is. This reflective surface 6a is coated with a 310 layer 12 as a highly reflective layer. As a coating method for this Si0 layer 12, for example, a boat method or a rotary method is adopted, and the reflectance (5oonm) thereof is about 85 for the Key 1 method and about 72 for the rotary method. During image exposure ITh, the exposure land 5 is turned on and travels f2, and the exposed t land 5 is reflected directly and by the reflective surface 6a of the reflector 6 to irradiate the original A and scan it. be done. The reflected light from the manuscript person is reflected by the mirror 7, 8, 9, then reflected by the mirror 1 through the lens 10, and further reflected by the slit 2.
The document image is guided onto the photoreceptor drum 22 via the . As described above, the reflective surface 6aI:si of the reflector 6
Since the Q layer 12 is coated, the light reflection efficiency is improved, and the amount of light irradiated onto the document can be increased without increasing the brightness of the exposure lamp 5. The six reflective surfaces of the reflector 6 may be coated with a multilayer film. The reflectance in this case is about 72
% (500 layer m). Further, the present invention is not limited to the above embodiment, but may be as shown in FIG. 3. That is, the reflector 21 is constituted by two divided pieces 21' and 21tt so as to be divided from approximately the center thereof, and the reflective surfaces of these divided pieces 21' and 2111 are formed into two approximately planar shapes. In addition, the divided portion of this reflector 21 allows the light from the exposure lamp 5 to pass through the document.
The range of reflection to 1s L is C2 so as to be divided at a point E that avoids the range 1- to F' and GG'. and,
The divided pieces 21', 21// of this reflector 21 are assembled with their proximal ends overlapped with each other and fixed with screws 23. Therefore, this reflector 21 is in a divided state,
The reflective surfaces of the divided pieces 21/, 211/, 27aI:Si
0 layer 12 is coated and then the dividing piece 21'
, 21/I are combined and their proximal ends are fixed with screws 23. According to this embodiment, since the Si0 layer 12 can be coated on each divided portion fzx', zxl/ with the reflector 21 divided, the workability of coating is excellent.
can be coated uniformly and obtain good reflection efficiency. [Effects of the Invention] As explained above, the present invention includes a device in which light from a light source is reflected by a reflective surface of a reflector and is irradiated onto an irradiated object. After coating with a reflective layer, the light reflection efficiency is significantly improved. Therefore, it is possible to obtain sufficient light glide without increasing the brightness of the i-light source as in the conventional method, which is economical and also prevents the temperature rise of the irradiated object, making it safe. . 4. Brief description of the drawings The drawings show one embodiment of the present invention.
It! :Schematically shows the image exposure system in the child copying machine
Fig. yIIJ2 is an enlarged side sectional view of the reflector, and Fig. 3 is a side sectional view showing another embodiment of the beam reflector. 5.°.Light source (exposure lamp), 6,21...Reflector (
reflector), 2... irradiated object, 12... high reflection layer (840 layers). Applicant's agent Patent attorney Takehiko Suzue Figure 3

Claims (1)

[Scope of Claim] An optical device characterized in that a reflective surface of the reflector is coated with a highly reflective layer. (2) The optical device according to claim 1, wherein the highly reflective layer is SIO I. (3) The optical device according to claim 1, wherein the high reflection layer is a multilayer film.