JPH0289462A - Original reader - Google Patents

Abstract

PURPOSE:To obtain a light, short and thin carriage by forming a light source, a light source drive section, a lens and a sensor support means to a member fixing both ends of a thin plate. CONSTITUTION:A recessed part 2b clipping a projection section 2a and a sensor 1 fitted to a positioning notch 3a of a lens 3 and positioning and fixing them is provided to a carriage base 2. Two shield plate 6 is fixed to the base 2, and positioned and fixed with the inverter 7. Moreover, the base 2 is provided with a projection 2c for mounting a slider chip 8 and a stationary section 2d of the light source 5. Through the constitution above, a carriage plate 4, a carriage base 2 and a shield plate 6 of a read head is able to be assembled by 4 screws and only three kinds of same shaped members are used and number of dies is halved, the reader is formed with high stiffness and light weight because of thin plate structure and the read head with low cost is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a document reading device, and more particularly to the structure of a reading head.

[Conventional technology]

5 and 6 are structural diagrams of main parts of the reading head of a conventional document reading device, and FIG. 5 is a front view of the head. In FIG. A lens 102 and a sensor 101 are arranged on a carriage 104 with the required dimensional accuracy, and a driving unit (hereinafter referred to as an inverter) 107 for the light 'a 103 is arranged so as to form an image on the sensor 101. A noise cover 116 is provided to block out oscillation noise. The lens 102 and the sensor 101 were fixed to the carriage 104 with screws 110 and 111, respectively. Although not shown, the light source 103 is fixed to both ends of the carriage 104 with screws.

Next, in order to read the original placed on the original platen 10B, it is fixed to both ends of the carriage 104 with screws in the direction of arrow A. Next, the carriage 104 is moved in the six directions of arrows in order to read the original placed on the original platen 108. For this purpose, shafts 112 are installed at both ends of the carriage 104, and the shafts 112 are fitted into the shafts 112. It had a structure in which a slider chip 113 was provided, and the carriage 104 was moved while sliding the slider chip 113 on a slide rail 109.

Here, the carriage 104 is made of a mold extruder made of aluminum or the like, and has a long hole 115 in the line direction of the sensor 101 in the carriage 104 in order to secure an optical path to the sensor IO1. FIG. 6 is a top view of FIG. 5 with the lens 102 removed. In FIG. 6, the carriage 104 has a structure in which it can be moved in the direction of arrow C by a moving means (not shown) on a slide rail 109 via a slider chip 113. Further, the carriage 104 requires the elongated hole 115 as described above, and due to the strength problem of the carriage 104, the hole 115 shown in FIG.
Certain dimensions were required.

In this way, the carriage 104 is attached to the lens 10.
2 and machining screw holes for fixing each of the sensor 101,
Secondary processing such as drilling a hole for planting the fitting shaft 112 of the slider chip 113 and processing the optical path elongated hole 115 was performed. There are many ways to process these, and even if expensive machines such as machining centers are used, the process is complicated. Further, the carriage 104
In order to perform the above-mentioned secondary processing, an external force is applied, so the overall structure was thicker in terms of strength. Furthermore, in order to embed the fitting shaft 112, the structure is partially thick.

[Problem to be solved by the invention]

However, as mentioned above, the structure of the reading head of a conventional document reading device requires a thick structure from the viewpoint of strength, and also requires 8 dimensions as shown in Figure 6, so it is heavy and long. I had no choice but to become For this reason, the carriage driving means that moves the reading head when reading the document requires a strong driving force, and it also requires a lot of secondary processing as mentioned above, making it difficult to reduce costs, which is a serious problem. was. Furthermore, with the above-mentioned configuration, the entire device becomes large, which poses a major problem in response to the recent trend toward smaller and lighter devices.

SUMMARY OF THE INVENTION The present invention solves these conventional problems, and aims to provide a compact, low-cost document reading device that uses a light, thin, short, and small carriage to perform secondary processing with an extremely small number of secondary processes.

[Means to solve the problem]

In order to solve the above problems, the document reading device of the present invention uses a plurality of conductive thin plates of the same shape and a member that firmly connects both ends of the thin plates to illuminate the document in a document reading device of a moving reading head type. a light source, a driving unit for the light source, and a lens that forms an image of the document on a sensor surface;
It is characterized by a structure that holds a sensor that converts a formed image into an electrical signal, and the light source, the drive unit for the light source, the lens, and the light source are attached to a member that firmly connects both ends of the shaped thin plate. It is characterized by comprising means for holding the sensor.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. 1 to 3 are structural diagrams of main parts of the reading head of the document reading device of the present invention, and are respectively a front view, a side view, and a top view. The lens 3 is sandwiched between the carriage plates by fitting the convex portions 4a of two thin plates 4 (hereinafter referred to as carriage plates 4) of the same shape. A light source 5 is placed on the lens 3 side, and a sensor 1 is placed at a position where the lens 3 forms an image of the document. An inverter 7 is placed in the space defined by the carriage plate 4. After arranging each device in this way, two carriage bases 2 having the same shape are placed on the carriage plate 4.
The sensor 1, the inverter 7, and the light source 5 are positioned and arranged at both ends, that is, in the longitudinal direction. In this state, although each device can be positioned, it is not fixed.

Next, two shield plates 6 for blocking inverter noise are fixed to the carriage base 2 with screws 9 along the stepped portions of the respective carriages 4 so as to sandwich the carriages 4 therebetween. The carriage base 2 is equipped with a slider chip 8. To explain in detail, the second
The figure is a side sectional view of FIG. 1, showing the lens 3 and the sensor 1.
The positioning state of one end of is shown. The carriage base 2 includes a convex portion 2a that fits into the positioning notch 3a of the lens 3, and four portions 2b that sandwich and position the sensor 1. The other end of each device is configured similarly. FIG. 3 is a top view of FIG. 1 showing the positioning and fixing of the inverter 7, and shows a state in which the two shield plates 6 and the carriage base 2 are fixed with screws 9. The carriage base 2 is provided with a convex portion 2C for attaching the slider chip 8, and is provided with a fixing portion 2d for the light source 5. The reading head constructed in this way is constructed by combining each device, two carriage plates 4 of the same shape, two carriage bases 2 of the same shape, and two shield plates of the same shape. screw 9
It is as simple as tightening the parts, and as three types of parts of the same shape are combined, the number of manufacturing molds for each part is halved, which simplifies the manufacturing management of each part and further reduces costs. . Furthermore, since it has a thin plate structure, it is lightweight and has high rigidity, which is effective in reducing the size of the reading head.

FIG. 4 is a diagram showing another specific example of the carriage plate of the present invention. In FIG. 4, two carriage plates 24 of the same shape made of extruded aluminum or the like are used to hold each device. , the carriage plate 2
4 is provided with a recess 24a for positioning the inverter 27, and the same effect can be obtained by fixing the shield plate 27 to the carriage base (not shown) as in the previous embodiment.

In the embodiments described above, each device can be held in the reading head by two thin plates and a shield plate of the same shape, and two members of the same shape, which is effective in reducing cost, size, and weight. .

〔Effect of the invention〕

As explained above, according to the configuration of the present invention, the reading head can be made highly rigid, lightweight, and compact, which is also effective in reducing costs, and it is possible to obtain a light, thin, short, and small document reading device.

[Brief explanation of drawings]

FIGS. 1 to 3 are structural diagrams of main parts of the reading head of the document reading device according to the present invention, and are a front view and a front view, respectively.
They are a side view and a top view. FIG. 4 is another specific example of the reading head according to the present invention, and FIGS. 5 and 6 are structural diagrams of main parts of the reading head of a conventional document reading apparatus, which are a front view and a top view, respectively. ■...Sensor 2...Carriage base 3...Lens 4...Carriage plate 6...Shield plate or above 53a34a4 / / , j , , i , i " Fig. 1 7, Insert 6! Seal P ゛ Insufficient 9 - ° Ne - Shi ゛ 7, - Press 2. (Illidge Pace 3, Lens 1 Fig. 2 24, ° Death Bridge Plate 26 , seal μ゛ slope 27, ° inverter Fig. 4 2: 〒 Yuri 1. G (-S 3: Shin 7 pa 6, ゛shield allowance ξ!! 1.'; Fig. 3 Fig. 5

Claims (2)

[Claims] (1) In a document reading device with a moving reading head, a light source illuminates the document using a plurality of electrically conductive thin films of substantially the same shape and a member that firmly connects both ends of the thin films of the substantially same shape;
A document reading device characterized in that it has a structure that includes a drive section for the light source, a lens that forms an image of the document on a sensor surface, and a sensor that converts the formed image into an electrical signal. (2) A document according to claim 1, characterized in that means for holding the light source, a drive unit for the light source, the lens, and the sensor are formed on a member that firmly fixes both ends of the shaped thin film plate. reading device.