JPH057801Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a photoelectric conversion device in a facsimile transmitter or the like, and particularly relates to a positioning structure for a condensing light transmitter array (hereinafter referred to as SLA).

[Conventional technology]

Conventionally, this type of photoelectric conversion device has been constructed as shown in FIG.

That is, a light emitting diode (hereinafter referred to as LED) unit 3 serving as a light source for illumination, an SLA 4 formed by arranging a large number of optical fibers whose refractive index is highest on its axis and decreases parabolically toward the periphery;
A substrate 2 to which a group of photoelectric conversion elements 1 arranged linearly is added is fixed by being inserted into a frame 5 having both ends thereof shaped like a nest of peaks.

Next, the optical system will be explained with reference to FIG.
Light is emitted from an LED unit (not shown) and illuminates the document 6. The amount of reflected light changes depending on the degree of darkness of the document at a certain point A on the document surface, and this reflected light
The light is focused by the SLA 4 on a point B of the photoelectric conversion element group 1 opposite to a point A of the original, and an electric signal proportional to the amount of reflected light is extracted.

That is, an electrical signal proportional to the degree of darkness of the original is extracted.

[Problem that the invention attempts to solve]

In the above-mentioned conventional photoelectric conversion device, the frame 5 is made by an aluminum extrusion method, so that the dimensions can be precisely specified relative to the specified dimensions, but there are the following problems.

The refractive index of SLA4 varies depending on the manufacturing lot. For this reason, the first method of absorbing the variation is to leave the length t ₁ of the SLA4 in the optical axis direction as it is and correct it by the conjugate length l, as shown in FIG. There are two ways to correct t ₁ while leaving the length l as it is, but since the size to be corrected is the first plan > the second plan, the second method is generally used.
The draft _t1 has been corrected. That is, for SLA4, _t1 varies. The substrate 2 may be a ceramic plate, a glass plate, etc., but generally an inexpensive glass plate is used. For this reason, in the manufacturing process of glass plates,
Due to variations in the plate thicknesses t ₁ and t ₂ , corresponding dimensions t ₁ ′ and t ₂ ′ of the frame 5 must also be increased.

Therefore, when these are combined, there is a problem in that positional variations occur, optically out of focus, and resolution deteriorates.

[Means for solving problems]

The photoelectric conversion device of the present invention includes a substrate having a group of photoelectric conversion elements arranged in a straight line, a light source that illuminates a document to be read, and a condenser that focuses reflected light from the document on a light receiving section of the group of photoelectric conversion elements. It is made up of a photonic light transmitter array, a pair of support fittings that support the condensing light transmitter array, and a frame that fixes the substrate, the light source, the condensing light transmitter array, and the support fittings, and is tightly attached to the original. In a contact type photoelectric conversion device that performs photoelectric conversion, the supporting metal has a tapered portion that determines the position of the light-concentrating light transmitter array in the optical axis direction and the longitudinal direction, and a tapered portion that determines the position of the light-concentrating light transmitter array in the optical axis direction. It has a pressing spring.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention.

The support fitting 7 that holds the SLA 4 is a metal fitting 7a made of a thick plate having a tapered portion 7b.
and a spring 7c, the connecting portions of which are connected by spot joints or the like. The intersection of the optical axis direction surface and the longitudinal end surface of the SLA4 contacts at point C of the tapered part 7b of the support metal fitting, and the surface of the SLA4 on the photoelectric conversion element group side is pressed by the spring 7c of the support metal fitting. There is.

The support fitting 7 of the frame 5 and the SLA 4 are inserted together, and the width of the attachment part of the SLA in the scanning direction is made almost the same as the width of the SLA 4 in the sub-scanning direction to prevent play in the sub-scanning direction of the SLA 4. The configuration is such that it does not allow this.

Light emitted from an LED unit 4 (not shown) is reflected at different reflectances depending on the density of a point A on the original 6, and the reflected light is directed to a photoelectric conversion element group 1 facing the point A on the original by the SLA 4. is imaged at point B and read.

In this case, in order to obtain the best resolution at point B, the position of SLA4 should be
- Must be in the middle between B.

That is, the distance between A and B is l, and SLA4 is from original 6.
Letting S be the distance to the center of , the best resolution is obtained when S=l/2.

Even if there are variations in the width (t ₁ ) of the SLA4 in the optical axis direction and variations in the thickness (t ₂ ) of the substrate 2,
If the distance between A and B at this time is l', and the distance to the center of SLA4 is S', then the relationship S' = l'/2' must be maintained, and the adjustment of SLA4 (movement of ΔS) must be maintained. ) is required.

If we now assume that we need to move SLA4, where l'<l, to position S' and adjust it for the best resolution, we can move the support bracket 7 to the right side in the longitudinal direction of SLA in Figure 1. .

By moving the support metal fitting 7 to the right, the contact part C that determines the position of the support metal fitting and SLA4 is
By moving to C', SLA4 is moved toward the document surface by ΔS, and the resolution is adjusted to be the best.

[Effect of idea]

As explained above, the present invention has a tapered part that determines the position of the SLA in the optical axis direction and the longitudinal direction, and a spring that presses the SLA in the optical axis direction.
This has the effect of being able to adjust the depth of focus of SLA.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an SLA support structure according to an embodiment of the present invention, Fig. 2 is a perspective development view showing a combined structure of a photoelectric conversion device, and Fig. 3 is a sectional view showing a conventional SLA support structure. Figure 4 shows the relationship between SLA position and relative resolution. 1...Photoelectric conversion element group, 2...Substrate, 3...
LED unit, 4...SLA, 5...frame,
6... Original, 7... Support metal fittings, 7a... Metal fittings, 7
b...Tapered part, 7c...Spring.

Claims (1)

[Scope of utility model registration request] A substrate having a group of photoelectric conversion elements arranged in a linear manner, a light source that illuminates a document to be read, and a condensing optical transmission body array that focuses reflected light from the document on a light receiving section of the group of photoelectric conversion elements. , a pair of support fittings that support the condensing light transmitting body array, and a frame that fixes the substrate, the light source, the condensing light transmitting body array, and the supporting metal fittings, and is in close contact with the document and performs photoelectric conversion. In the contact type photoelectric conversion device, the supporting metal fitting includes a tapered portion that determines the position of the condensing light transmitting body array in the optical axis direction and the longitudinal direction, and a spring that presses the concentrating light transmitting body array in the optical axis direction. A photoelectric conversion device comprising: