JPH02246672A - Picture information reader - Google Patents

Abstract

PURPOSE:To make conventional cutting work unnecessary, and to reduce cost by constituting a lens block holding member of a first and a second members capable of being divided into two parts as making a lens block a boundary, and forming an optical path between both the members. CONSTITUTION:The lens block 6 is arranged in the vicinity of a light source 5 while keeping a state of its light incident surface 6a is opposed to an original placing table 2 side. This lens block 6 is held through the lens block holding member 7. The lens block holding member 7 is constituted of the first and the second members 7a, 7b capable of being divided into two parts as making the lens block the boundary. Then, the first and the second members 7a, 7b to constitute the lens block holding member 7 are fastened by appropriate force by using a screw 17 and a nut 19, and the lens block 6 is held in the state that its warp is corrected. As the result, the optical path 11 can be formed between two members 7a, 7b. Thus, the conventional cutting work is not required, and the reduction of the cost can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to improvements in image information reading devices such as image scanners used in printers, facsimile machines, and the like.

(Prior Art) This type of image information reading device usually includes a lens block consisting of a lens row held by a lens block holding member, and converts optical image information of a document guided by the lens block into an electrical signal. The structure includes a photoelectric conversion means.

However, in the conventional device, as shown in FIG. 4, the lens block holding member that holds the lens block a has an integral structure made of an extruded material in the shape of an inverted T. The lens block a is pressed against one side of the vertical part of the lens block holding member by the leaf spring C, and even if there is an error such as warpage in the lens block a, the pressing of the leaf spring member C is corrected by force. Was. Furthermore, the optical path e from the light emitting end face of the lens block a to the optical sensor d serving as photoelectric conversion means was formed by cutting.

(Problems to be Solved by the Invention) As described above, the conventional device not only requires cutting to form the optical path e, but also requires the lens block a.
In order to correct the warpage, it is necessary to use a long plate spring member C with a strong spring force, resulting in problems such as high production cost and complicated structure.

The present invention has been made based on the above circumstances, and its purpose is to provide a simple structure that can reliably hold a lens block in a state in which the warpage is corrected, and also to reduce production costs. The present invention aims to provide an image information reading device.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides an image information reading device that reads image information of a document placed on a document table, A lens block with a light incident end face facing the mounting table side, a lens block holding member that holds this lens block in a predetermined position, and a lens provided on the light output end face side of the lens block held by this lens block holding member. and a photoelectric conversion means for converting optical image information of the document guided by the block into an electrical signal, and the lens block holding member is divided into two parts with the lens block as a border. The structure is made up of a second member.

(Function) That is, according to the present invention, since the lens block holding member is composed of the first and second members divided into two parts with the lens block as a border, these first and second members are divided into two parts. An optical path can be formed between the second members. This eliminates the need for machining as in the past, making it possible to reduce costs. Also, the first lens block is placed between the lens blocks. By fastening the second member, the lens block is held in a state where the warpage is corrected. This eliminates the need for the conventionally required leaf spring member, making it possible to simplify the configuration and reduce costs.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 2 shows the appearance of the image information reading device with the document holding cover open. In the figure, reference numeral 1 denotes the main body of the apparatus, and on the top surface of this main body 1, there is provided an original placing table 2 made of transparent glass for placing an original. A document holding cover 3 is provided which can be opened or closed. Further, inside the apparatus main body 1, an image reading unit 4, a unit supporting means, a unit moving means, a power supply device, a control circuit board, etc. (not shown) are housed.

The image reading unit 4 is configured as shown in FIG. In the figure, reference numeral 5 denotes a light source that irradiates light toward the original platen 2 to illuminate the image forming surface of the original plate, and in the vicinity of this light source 5, there is a light incident end face 6a facing the original platen 2 side. A lens block (lens row) 6 is arranged at . This lens block 6 is held via a lens block holding member 7, and an optical sensor 8 as a photoelectric conversion means is provided on the light emitting end surface 6b side of the lens block 6. The optical image information of the document guided by the lens block 6 is then imaged onto the sensor 8, thereby being converted into an electrical signal.

The lens block holding member 7 is divided into two parts with the lens block 6 as a border, as shown in FIG. Second
It consists of members 7a and 7b. These, 1st. The second members 7a and 7b are common parts with the same cross-sectional shape, and the lens block holding surface 1 that comes into contact with the side surface of the lens block 6
0, a stepped portion 12 for forming an optical path 11, and a positioning portion 13 for the optical sensor 8. Also,
A lens block 6 is attached to the lens block holding surface 10.
Positioning holes 15 formed at both longitudinal ends of the
A positioning pin 16 is provided to protrude and fit into the lens block 6, so that the positional accuracy of the lens block 6 can be maintained. Further, screw insertion holes 18 into which screws 17 can be inserted are formed on the lens block holding surface 10 and the longitudinal self-portion end side of the lens block 6, respectively. The first screw 17 and the nut 19 screwed into the screw 17 constitute the lens block holding member 7. Second
By tightening the members 7a and 7b with an appropriate force, the lens block 6 is held in a state in which the warp is corrected.

Furthermore, the optical sensor 8 is moved to the first
．． It is fixed in a pressed state against the positioning surfaces 13.13 of the second members 7a, 7b, so that positional accuracy with respect to the light emitting end surface 6b of the lens block 6 can be obtained.

Note that 21 shown in FIG. 3 connects the light passage hole to the cover glass 22.
It is a unit airtight cover that is closed by the optical path 11.
The opening is sealed by an optical sensor 8.

Note that the image reading unit 2 configured in this way is
It is mounted on a carriage (not shown) and is moved back and forth in the direction of arrow A shown in FIG. 2 along the lower surface of the document platform 2, so as to scan the surface of the document placed on the document platform 2.

Thus, the lens block holding member 7 is divided into two parts with the lens block 6 as a border. Since it consists of the second members 7a and 7b, these first members 7a and 7b. An optical path 11 can be formed between the second members 7a, 7b. This eliminates the need for machining as in the past, making it possible to reduce costs. In addition, the first lens block 6 is sandwiched between the lens block 6 and the lens block 6. Second member 7a.

The lens block 6 is held in a state in which the warp is corrected by the two fastenings 7b. This eliminates the need for the conventionally required leaf spring member, making it possible to simplify the configuration and reduce costs.

In addition, the first and second lenses constituting the lens block holding member 7 are
By forming the members 7a and 7b as common parts having the same cross-sectional shape, production costs can be further reduced.

It goes without saying that the present invention is not limited to the above-mentioned embodiment, and can be modified in various ways without departing from the gist.

[Effects of the Invention] As explained above, the present invention provides an image information reading device that has a simple structure, can reliably hold a lens block in a state in which warpage is corrected, and can reduce production costs. This has the effect of being able to provide the following.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
Fig. 1 is a schematic exploded perspective view of the main parts, Fig. 2 is a schematic perspective view showing the document holding cover of the image reading device in an open state, and Fig. 3 is a schematic cross-section of the image reading unit, which is the main part. 4 are schematic perspective views showing the structure of a conventional image reading unit. 2...Document placement table, 4...Image reading uni-soto,
6... Lens block, 6a... Light incidence end surface, 6b
... light emitting end surface, 7 ... lens block holding member,
7a...first member, 7b...second member, 8...
- Photoelectric conversion means (light sensor), D... original. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure I2

Claims (1)

[Claims] An image information reading device that reads image information of a document placed on a document placing table, the lens block having a light incident end surface facing the document placing table, and a lens block that holds the lens block in a predetermined position. a holding member; and a photoelectric conversion means provided on the light emitting end surface side of the lens block held by the lens block holding member and converting optical image information of the document guided by the lens block into an electrical signal, An image information reading device characterized in that the lens block holding member consists of a first member and a second member that are divided into two parts with the lens block as a boundary.