JPS63287253A - Contact type image sensor - Google Patents

Abstract

PURPOSE:To prevent an undersired reflected light from being made incident on an IC image sensor chip by fitting a light shielding plate made of an elastic member to the side face of a rod lens array. CONSTITUTION:The light shielding plate 9 made of an elastic member is fitted to the side face of the rod lens array 6, the length of the light shielding plate 9 is selected longer than the IC image sensor chip 5 and the height is selected to be a height brought into contact with a base 8 or above. For example, a mount 7A positioning the rod lens array 6 is selected longer than the length of the rod lens array 6 and the light shielding plate 9 is provided on one side of the rod lens array 6 in the main scanning direction. Thus, the undersired reflected light made incident from a space between the IC image sensor chip 5 and the rod lens array 6 is shielding by a simple structure and the reading with high resolution is attained by means of the titled contact type image sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image reading device, and particularly to a contact type image sensor.

[Conventional technology]

FIG. 4 is a sectional view showing a conventional contact type image sensor disclosed in, for example, Japanese Patent Publication No. 59-42511, and FIG. 5 is a perspective view of essential parts of the contact type image sensor shown in FIG. , l is a fluorescent lamp as a light source, 2 is a holder for fixing the fluorescent lamp 1, 3 is a glass plate on which the original M is placed, 4 is a substrate provided facing the original M, and 5 is arranged on the substrate 4. The IC image sensor chip 6 detects the image surface of the document M illuminated by the fluorescent lamp L.
A rod lens array for forming an erect equal-magnification real image on the image sensor chip 5; 7 is a mount for fixing the rod lens array 6; 8 is a substrate 4. The base for loading Mount 7 etc. is shown.

Next, the operation will be explained.

Light from a fluorescent lamp l placed under the original M is irradiated onto the original M placed on the glass plate 3, and reflected light from the original M enters the rod lens array 6.

This rod lens array 6 forms the reflected image from the original M on the IC image sensor chip 5 on the substrate 4 as an erect, same-size image, and the IC image sensor chip 5 converts the reflected image from the original M into an electrical signal. to read the original M.

The above operation is performed in the arrangement direction of the IC image sensor chips 5 (
This is a one-line operation in the main scanning direction), and this operation is performed on the document M or the fluorescent lamp 1. A document M is read while moving one side of a sensor system consisting of a substrate 4, an IC image sensor chip 5, and a rod lens array 6.

[Problem that the invention seeks to solve]

Since the conventional contact type image sensor is constructed as described above, as shown in FIG. There was a problem that the resolution decreased due to the incident light.

This invention was made in order to solve the above-mentioned problems, and uses a simple structure to block unnecessary reflected light that enters between the IC image sensor chip and the rod lens array, thereby achieving high-resolution reading. The purpose of this study is to obtain a contact-type image sensor that can

(Means for Solving the Problems) In the contact image sensor according to the present invention, a light shielding plate formed of an elastic member is attached to the side surface of the rod lens array, and the length of the light shielding plate is set to the length of the IC image sensor chip. The height is longer than that, and the height is higher than the height that touches the substrate.

(Function) In the contact type image sensor of the present invention, the lower end of the light shielding plate made of an elastic member is in close contact with the substrate on which the IC image sensor chip is mounted, thereby shielding unnecessary reflected light from the IC image sensor chip.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a contact type image sensor according to an embodiment of the present invention, FIG. 2 is a side sectional view of an end portion of the contact type image sensor shown in FIG. 1, and FIG. 3 is shown in FIG. 1. 5 is a plan view of a contact type image sensor, in which the same parts as in FIGS. 4 and 5 are given the same reference numerals, 7A is a mount for positioning the rod lens array 6, and 7B is a mount 7A for positioning the rod lens array 6. FIG. Shows a leaf spring that is pressed against and fixed.

Reference numeral 9 denotes a light shielding plate attached to the side surface of the rod lens array 6, the length of which is longer than the length of the IC image sensor chip 5, and has a height greater than that in contact with the substrate 4 in the attached state.

10 is a cover, and 11 is a filter, which is fixed to the cover lO between the fluorescent lamp l and the document M.

Next, the operation will be explained.

Light from a fluorescent lamp 1 placed under the original M passes through a filter 11 and is irradiated onto the original M placed on the glass plate 3, and the reflected light from the original M enters the rod lens array 6. .

This rod lens array 6 forms the reflected image from the original M on the IC image sensor chip 5 on the substrate 4 as an erect, same-size image, and the IC image sensor chip 5 converts the reflected image from the original M into an electrical signal. to read the original M.

The above-mentioned operation is an operation of one line in the arrangement direction of the IC image sensor chip 5, and this operation is performed on the document M or the fluorescent lamp 1. Substrate 4. A document M is read while moving one side of a sensor system consisting of an IC image sensor chip 5 and a rod lens array 6.

When reading the document M in this manner, the light shielding plate 9 attached to the side surface of the rod lens array 6 is made of an elastic material, so it comes into close contact with the substrate 4 and prevents unnecessary reflected light from being reflected from the IC image sensor chip 5. Blocks light from entering.

In the above embodiment, the fluorescent lamp 1 is used as the light source, but an LED lamp or the like may be used as the light source.

Also, a mount l- for positioning the rod lens array 6 is provided.
7A uses a lens longer than the length of the rod lens array 6, and a light shielding plate 9 is provided on one side of the rod lens array 6 in the main scanning direction. The rod lens array 6 may be fixed, and the light shielding plates 9 may be provided on both sides of the rod lens array 6 in the main scanning direction so as to sandwich the rod lens array 6 therebetween.

〔Effect of the invention〕

As explained above, according to the present invention, a light shielding plate made of an elastic member is attached to the side surface of the rod lens array, the length of the light shielding plate is made longer than the length of the IC image sensor chip, and the length of the light shielding plate is made longer than the length of the IC image sensor chip. Since the height is higher than the contact, unnecessary reflected light will not be incident on the IC image sensor chip, resulting in high-resolution reading.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a contact type image sensor according to an embodiment of the present invention, FIG. 2 is a side sectional view of an end portion of the contact type image sensor shown in FIG. 1, and FIG. 3 is shown in FIG. 1. A plan view of the contact type image sensor, Fig. 4 is a sectional view showing a conventional contact type image sensor, Fig. 5 is a completed view of the main parts of the contact type image sensor shown in Fig. 4, and Fig. 6 is an explanatory diagram. be. In the figure, l is a fluorescent lamp, 2 is a holder, 3 is a glass plate, 4 is a substrate, 5 is an IC image sensor chip, 6 is a rod lens array, 7 and 7A are mounts, 7B is a leaf spring, 8 is a base, and 9 indicates a light-shielding plate, and M indicates a manuscript. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) A light source, a substrate provided to face the original onto which light from the light source is irradiated, IC image sensor chips arranged on the substrate so as to cover the width of the original without any gaps, and this IC image. In the contact type image sensor, the contact type image sensor includes a rod lens array that images reflected light from the irradiated scanning line portion of the document on the IC image sensor chip as a substantially one-to-one erect real image. A contact image sensor characterized by having a light shielding plate made of an elastic material attached to the side surface of a lens array. (2) The contact type image sensor according to claim 1, wherein the light shielding plate is longer than the length of the IC image sensor chip. (3) The contact image sensor according to claim 1, wherein the light shielding plate has a height that is at least in contact with the substrate when attached to the side surface of the rod lens array.