JPS61194458A - Image information reader - Google Patents

Abstract

PURPOSE:To cool efficiently an image reading unit by setting the stand-by position of the image reading unit right before a cooling means. CONSTITUTION:The image reading unit 4 is provided in a main device body 1 so that it makes a horizontal scan reciprocally and a cooling fan 10 is fitted on the rear side of the main body 1. A fluorescent lamp light source 6, a light converging fiber lens 7, an image sensor 8, and a printed board (PC) 9 are incorporated in the unit 6 in one body. Then, the stand-by position of the unit 4 is set right before the cooling fan 10. Consequently, the reading unit 4, specially, PC plate 9 is cooled efficiently in stand-by mode to prevent malfunction, thereby obtaining a stable image signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image information reading device used in, for example, an image forming apparatus.

[Technical backbone of the invention and its problems]

Conventionally, in this type of image information reading device, as shown in FIG. 2 and FIG. There is an apparatus in which an image reading unit 4 provided in the main body I of the apparatus is pressed down by a freely movable document holding cover 3 and reads image information in a reciprocating manner 1-7.

The image reading unit 4 shown in FIG. A carriage 5, which moves horizontally along the lower surface of the document table 2 by a moving mechanism, is equipped with a fluorescent lamp (tubular body) light source 6, a light-focusing fiber lens 7, and an image sensor (photoelectric converter, for example, a COD element) 8. The original is illuminated by the light source 6 as the carriage 5 moves from the front 1a side to the rear 16 side of the apparatus main body 1. The reflected light of each line of the image information of A is guided to the image sensor 8 via the lens 7, and the signal converted by the image sensor 8 is converted to P.
Digital signal conversion using the amplifier circuit and A/D conversion circuit formed on the C board 91. In addition to being designed to send the data to a recording device (not shown), the arrangement structure allows the entire device to be made thinner.

However, since such four image reading units are most susceptible to heat, the propeller fan 10 is usually installed on the rear 16 side of the device main body I, where an inverter circuit (not shown) for supplying power to the light source 6 is installed. This propeller fan 10 sucks outside air from the front 1a side of the device main body 1.1. The image sensor 8, PC board 9, and inverter circuit, which are always energized, are on standby in order to shorten the rise time of signals and four forces during copying. However, these circuits generate a considerable amount of heat even when on standby, and the four one-sided image reading units are cooled to the front 1a of the main body I when on standby. Since it is located on the side, it is farthest from the propeller fan 10, so there is a problem that it is not possible to cool the PC board 9 efficiently.

[Purpose of the invention]

The present invention has been made under the above circumstances, and an object of the present invention is to provide an image information reading device that is capable of increasing the cooling efficiency of an image reading unit while it is on standby.

[Summary of the invention]

” Second Book 1. [1] In order to achieve the object, the present invention reads a document by reciprocating an image reading unit from the front side to the rear side of the apparatus main body, and also installs a cooling means in the apparatus main body.1. In the image tlrl follow-up device, the standby position of the image reading unit is located immediately before the cooling means; 1. It is something that

[Embodiments of the invention]

The present invention will now be described with reference to an embodiment shown in FIG. In the illustrated example of the present invention, the same reference numerals are used for parts having the same configuration as the conventional structure shown in FIGS. 2 and 3, and the explanation thereof will be omitted.

That is, as shown in FIG. 1, in the present invention, the image reading unit 4, which reciprocates in the horizontal direction along the lower surface of the document mounting table 2, is moved to the rear 1b of the apparatus 4 main body l in a standby state.
Place it on the side [7] in front of the cooling fan 10, and at the time of copying, as shown by the two-dot dashed line, once on the main body 1)
It is configured to scan back and forth after being moved to the Iaf 11I.

Therefore, according to the above-described configuration, the standby position of the image reading unit 4 is 1. Therefore, the image reading unit 4 can be efficiently cooled during a standby time that is generally much longer than one hour of copying.
The CCD element and A/D conversion part that make up the photoelectric conversion part are
b9. - It is possible to prevent malfunctions of the IC of the A/D converter due to heat.

In the above embodiment, a propeller fan is used as the cooling means, but the present invention is not limited to this, and for example, a line-floating σ-faso or the like may be used.

〔Effect of the invention〕

As explained above, according to the present invention, since the image reading unit during standby is located close to the cooling means, the image reading unit is efficiently cooled and a good image signal can be stably obtained. It has the excellent effect of increasing the lifespan.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an image information reading device according to the present invention, FIG. 2 is an external perspective view showing a conventional example, and FIG. 3 is a similar schematic sectional view. 1... Apparatus body, 4... Image reading unit, 10.
...Propeller fan, A...Manuscript.

Claims (1)

[Claims] In an image information reading device in which an image reading unit is reciprocally scanned from a front side to a rear side of an apparatus main body to read a document, and a cooling means is installed in the apparatus main body, a standby position of the image reading unit is positioned immediately before the cooling means. An image information reading device characterized in that: