JP2773409B2 - Film image converter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film image conversion device that reads a film image by a linear image sensor and converts the image into an electric signal.

[Conventional technology]

 FIG. 2 shows an example of a conventional film image converter.

In FIG. 2, a projection optical system 3 and a linear image sensor 4 are attached to an optical base 12, and constitute a projection optical system block.

The scanning stage 2, the film holder 5, the stepping motor 8, the joint 9, the lead screw 11, and the stage guide bar 10 are attached to the scanning mechanism base 13 to constitute a scanning mechanism block.

Since the scanning mechanism system block and the projection optical system block have independent base portions such as an optical base 12 and a scanning mechanism base 13, a fixing screw 14 is provided.
The two parties concluded.

When converting a film image into an electric signal, a light beam emitted from a light source 7 passes through a film original 6 held by a film holder 5 installed on the scanning stage 2. The transmitted light forms an image on the linear image sensor 4 by the projection optical system 3. The linear image sensor 4 converts the imaged light beam into an electric signal corresponding to the image of the film original 6 (main scanning). At the same time, the lead screw 11 is jointed by a stepping motor 8 controlled by a control system (not shown). 9, the scanning stage 2 moves in the sub-scanning direction.

As a result, the entire image of the film original 6 is converted by the linear image sensor 4 into an electric signal.

Since the stage 2 is driven by the lead screw 11 and is configured to move on the two linear guide mechanisms 10, movement of the lead screw 11 in a direction other than the longitudinal direction due to the processing accuracy of the lead screw 11 is suppressed.

[Problems to be solved by the invention]

The conventional film image converter as described above has the following problems.

(1) Since a step of assembling the respective base portions of the scanning mechanism system block and the projection optical system block with fixing screws is required, the number of assembling steps of the film image conversion apparatus has been increased.

(2) When fixing the base portions of the two blocks, it is necessary to improve the accuracy of the combination, and it has been necessary to improve the accuracy of each component constituting the both blocks.

(3) Since there is no space between the scanning mechanism system block and the projection optical system block, lubricating oil applied to a drive unit such as a lead screw attached to the scanning mechanism base is applied to the projection optical system. There is a risk of scattering and contaminating the lens and the like of the projection optical system.

An object of the present invention is to solve the above conventional problems.

[Means for solving the problem]

For this purpose, in the present invention, a scanning mechanism system block for holding and moving a document, a projection optical system block for forming illumination light transmitted through an image on the document on an image forming surface, In a film image conversion device provided with a linear image sensor provided, the scanning mechanism system block and the projection optical system block are installed on the same base, and the scanning mechanism system block and the projection optical system block are The base was formed so as to partition the base.

[Action]

In the present invention, since the scanning mechanism system block and the projection optical system block are installed on the same base, there is no need for a fixing screw for fixing the two blocks as in a conventional device.

Further, it is possible to simultaneously process the lens mounting surface of the base and the mounting surface of the linear guide of the scanning mechanism.

In addition, since the wall that partitions the two blocks is formed as a base, it is possible to prevent the lubricating oil from scattering from the scanning mechanism block to the projection optical system block.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the present invention. Hereinafter, description will be made with reference to FIG.

In FIG. 1, on a base 1, components of a scanning mechanism system and a projection optical system are arranged. And, between the components of the scanning mechanism system and the components of the projection optical system, a wall 1a that partitions the two components,
The base 1 is formed.

That is, components of the scanning mechanism system are installed on one side of the wall 1a formed on the base 1, and components of the projection optical system are installed on the other side.

The stepping motor 8 drives the lead screw 11 via the joint 9. By driving the lead screw 11, the scanning stage 2 moves in the longitudinal direction of the lead screw 11. A film holder 5 for holding a film original 6 is set on the scanning stage 2.

The linear guide mechanism 10 includes a lead screw 11 of the scanning stage 2.
Is a known mechanism for accurately and linearly moving the scanning stage 2 by suppressing the movement other than the longitudinal direction that occurs during the rotational driving of the scanning stage 2.

Further, the projection optical system 3 irradiates the linear image sensor 4 with a light beam emitted from the light source 7 and transmitted through the film original 6.

By the way, the operation of the film image conversion apparatus according to the present invention having the above-described configuration is performed in the same manner as the conventional apparatus, and therefore, the detailed description is omitted.

〔The invention's effect〕

As described above, in the present invention, the scanning mechanism system block and the projection optical system block are installed on the same base, and the base is formed so as to partition the scanning mechanism system block and the projection optical system block. Has the effect.

(1) Since a fixing screw or the like for fixing the base portions of both blocks as in the conventional device is not required, the number of parts of the device is reduced, and the number of assembling steps is also reduced.

(2) Simultaneous processing of the lens mounting surface of the base and the mounting surface of the linear guide becomes possible, and the film document feeding accuracy is improved.

(3) Since the wall formed on the base prevents the lubricating oil from scattering from the scanning mechanism system to the projection optical system, the lens of the projection optical system is not stained.

[Brief description of the drawings]

 FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional film image converter. [Explanation of Signs of Main Parts] 1 Base 1a Wall 2 Scanning stage 3 Projection optical system 4 Linear image sensor 5 Film holder 6 Film original 7 Light source 8 Light source 8 Stepping motor 9 Joint 10 Linear guide mechanism 11 Lead screw 12 Optical base 13 Scanning mechanism base 14 Fixing screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 1/00

Claims (1)

(57) [Claims] 1. A scanning mechanism block for holding an original and moving the original when reading the image of the original, and a projection optical system block for forming an illumination light transmitted through an image on the original on an image forming surface. And a film image conversion device comprising a linear image sensor provided on the image forming surface, wherein the scanning mechanism system block and the projection optical system block are installed on the same base, and the scanning mechanism system block A film image conversion apparatus, wherein a base is formed so as to partition the projection optical system block and the projection optical system block.