JPH06168352A - Optical reader - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an optical reader having excellent reading reliability. A sheet pressing member 30 made of an opaque material for pressing the slit sheet 40 near the reading opening on the inner surface of the optical head body is provided.
0 has a light regulating hole 33 corresponding to the light transmitting portion 41 of the slit sheet 40, and the other of the light regulating holes 33 is the light emitting element 2
0 corresponds to the light emitting portion and the light receiving portion of the light receiving element 21, and one end surface of the sheet pressing member 30 covers the vicinity of the light transmitting portion 41 of the slit sheet 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head main body having a reading opening, a slit-shaped light transmitting portion, and a slit sheet arranged near the reading opening of the optical head main body, and a slit sheet thereof. A light-emitting element that irradiates the object to be detected with light from the light-transmitting part of the slit sheet through the reading opening of the optical head body, and the light-transmitting part of the slit sheet from the opening for reading light from the object to be detected The present invention relates to an optical reading device having a light receiving element that receives light through.

[0002]

2. Description of the Related Art FIG. 20 is a schematic plan view of an optical reading apparatus according to a conventional example.

In the figure, 1 is an optical head main body, 2 is a slit sheet made of, for example, a metal sheet, etc., which is adhered to the optical head main body 1 so that a central slit 2a is brought close to a lower card 3, and 4 is a slit sheet. 2 is a reflection type photo sensor disposed above the central portion of the card 2. The mark 5 on the card 3 is read through the slit 2a while the card 3 is horizontally moved.

[0004]

As described above, since the slit sheet 2 is fixed to the optical head main body 1 with the adhesive, it takes time to dry the adhesive, the work efficiency is poor, and the slit sheet 2 is used at the time of bonding. May be misaligned.

The slit 2 on the surface of the slit sheet 2
Since the vicinity of “a” is exposed, the light L ₁ and L ₂ reflected at that portion were also received by the reflection type photo sensor 4. Therefore, the S / N of a predetermined value cannot be obtained, and there is a problem in reliability.

The present invention has been made based on such a background, and an object thereof is to solve the above-mentioned drawbacks of the conventional apparatus and to provide an optical reading apparatus having excellent reading reliability.

[0007]

The above object is to provide an optical head main body having a reading opening, and a slit sheet having a slit-shaped light transmitting portion and arranged near the reading opening of the optical head main body. , A light-emitting element that irradiates the detected object with light from the light-transmitting portion of the slit sheet through the reading opening of the optical head body, and the light from the detected object through the reading opening of the optical head body through the slit sheet. In an optical reading device having a light receiving element that receives light through a light section, a sheet pressing member made of an opaque material that presses the slit sheet near the reading opening on the inner surface of the optical head body is provided, and the sheet pressing member is The slit sheet has a light regulating hole corresponding to the light transmitting portion, and the other of the light regulating holes corresponds to the light emitting portion of the light emitting element and the light receiving portion of the light receiving element. Cage, near the light-transmitting portion of Yotsute Suritsutoshito on one end face of the sheet pressing member can be achieved by the first means are covered.

Further, the above-mentioned object is that in the first means, the other end surface of the sheet pressing member covers the end surface excluding the light emitting portion of the light emitting element and the end surface excluding the light receiving portion of the light receiving element. It is achieved by means of 2.

Further, in the first means, the above object is as follows.
This is achieved by the third means in which the sheet pressing member also serves as an element holder for holding the light emitting element and the light receiving element.

Further, the above object is, in the first means, that the slit sheet comprises a transparent base film and an opaque layer printed on the surface of the base film.
This is achieved by the fourth means in which the non-printed portion of the opaque layer is the light transmitting portion.

Further, the above-mentioned object is achieved by the fifth means in the first means, wherein the object to be detected has a phosphor mark.

[0012]

In the first means, since one end surface of the sheet pressing member covers the vicinity of the through hole portion of the slit sheet, the reflected light from this portion can be eliminated, and as a result, S It is possible to improve the read reliability by improving / N more than the conventional one.

In the second means, since the other end face of the sheet pressing member covers the light emitting element and the light emitting portion of the light receiving element, and the end surface excluding the light receiving portion, the reliability of reading can be further increased. it can.

In the third means, since the sheet pressing member also serves as the element holder for holding the light emitting element and the light receiving element, the number of parts of the entire apparatus is reduced, the number of assembly steps is simplified, the size is reduced, and the cost is reduced. It can be reduced.

In the fourth means, since the portion other than the light transmitting portion of the slit sheet is formed of the opaque layer, the light reflection preventing effect in this portion can be further enhanced and the airtightness can be maintained.

In the fifth means, the invisible phosphor mark can be accurately read.

And the like.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a conceptual diagram of a bar code reader equipped with an optical reading device.

In the figure, 6 is a bar code reader body,
Reference numeral 7 is a printed circuit board mounted therein, and 8 is an insertion groove for an object to be detected such as a pre-paid card. The optical reading device A is installed so as to face the insertion groove 8.

FIG. 2 is an exploded perspective view of the optical reading apparatus according to this embodiment.

In the figure, reference numeral 10 denotes a head cover, which has engaging claws 12 on the inside of the tips of four legs 11 projecting downward.

Reference numeral 20 is a light emitting element, 21 is a light receiving element,
Both constitute a reflection type photo sensor.

Reference numeral 30 denotes the light emitting element 20 and the light receiving element 21.
Element holder part 3 for inserting and holding the lower end parts of the
1, 32 and a slit-shaped light regulation hole 33 on the lower surface thereof,
Further, it is an opaque sheet pressing member colored in black, for example, having engaging pieces 34 on both right and left sides.

Reference numeral 40 is a slit sheet having a light-transmitting portion 41 formed in the center and two positioning holes 42 formed in front and behind the light-transmitting portion 41 when viewed from the front.

Reference numeral 50 designates a mounting hole 52 formed in the center of each of the ear pieces 51, 51 projecting forward and backward, an engaging concave portion 53 for locking the engaging claws 12 provided at four places on the bottom, The optical head body has an engaging groove 54 into which the engaging piece 34 is inserted, a positioning pin 55 to be inserted into the positioning hole 42, and a reading opening 56 formed in a central bottom portion.

FIG. 3 is a front sectional view of the optical reading apparatus according to this embodiment.

As shown in the figure, the slit sheet 40 is
The sheet pressing member 30 having a substantially arcuate bottom surface is mechanically sandwiched between the sheet pressing member 30 and the tapered surface of the optical head main body 50, and the central light transmitting portion 41 facing the light regulating hole 33 projects downward to open the reading opening. It is curved and held so as to be pressed against the portion 56. Further, the vicinity of the transparent portion 41 of the slit sheet 40 is covered by the bottom surface of the sheet pressing member 30. Further, the top surface of the sheet pressing member 30 allows the light emitting element 2
The end surface of the light receiving element 21 excluding the light emitting surface and the end surface of the light receiving element 21 excluding the light receiving portion are covered.

Further, the light emitting element 20 and the light receiving element 21 are formed by pressing the pin 13 formed on the inner surface of the head cover 10.
It is pressed from the top by the to prevent it from rising.

FIG. 4 is a side sectional view of the optical reading apparatus according to this embodiment. The terminal 20 a of the light emitting element 20 and the terminal 21 a of the light receiving element 21 respectively project outward from the opening 14 of the head cover 10.

FIG. 5 shows a head cover 1 of this optical reader.
6 is a front view of the head cover 10, FIG. 7 is a side view of the head cover 10, and FIG. 8 is a bottom view of the head cover 10. In these figures, four legs 11 and 4 are shown. Two engaging claws 12 and two pressing pins 1
3, as well as two openings 14 and the like, respectively, are shown.

FIG. 9 is a front view of the sheet pressing member 30, FIG.
Reference numeral 0 is a side cross-sectional view of the sheet pressing member 30, which is a cylindrical element holding portion 31a having a high height, a cylindrical element holding portion 32a having a low height, and a slit-shaped light regulating hole formed below them. 33 is shown.

FIG. 11 is a plan view of the sheet pressing member 30, and FIG. 12 is a bottom view thereof.

FIG. 13 is a plan view showing an example of the slit sheet 40. In this example, a transparent plastic base film made of, for example, polyethylene terephthalate (PET) or the like is covered with an opaque layer 41a made of a black print layer except for the light transmitting portion 41.

FIG. 14 is a plan view showing another example of the slit sheet 40. In this example, a thin metal plate such as stainless steel is used to form the transparent portion 41 and the positioning hole 42 by punching. When the slit sheet 40 made of this thin metal plate is used, it is used in a pre-curved state as shown in FIG.

FIG. 16 is a front view of the optical head body 50.
The mounting hole 52 provided in the ear piece 51 is shown by a broken line.

FIG. 17 is a front sectional view of the optical head main body 50, showing the ear piece 51, the mounting hole 52, the engaging recess 53, the positioning pin 55, the reading opening 56 and the like.

FIG. 18 is a plan view of the optical head main body 50.
The ear piece 51, the mounting hole 52, the engaging groove 54, the positioning pin 55, the reading opening 56, and the like are shown.

FIG. 19 is a bottom view of the optical head body 50.
The ear piece 51, the mounting hole 52, the engagement recess 53, the reading opening 56, and the like are shown.

When a fluorescent substance mark (latent image mark) is read using the optical reading device of the present invention, it has the following uses and features.

1. Factories Automation (FA) -related Partial control at the time of assembling automobiles, that is, by using a phosphor mark (latent image mark) that makes it difficult to see vehicle type, export destination country, manufacturing date, and lot, etc. It can be managed without damaging the appearance.

2. The mark can be read even by keying on a black object such as a tire or a transparent object such as glass that cannot be read by the conventional reflective bar code.

3. Even if characters or designs are printed on the phosphor mark (latent image mark), the phosphor mark (latent image mark) can be read, so a small space such as a product price tag or product tag can be effectively used. it can.

4. The above 1. And 3. For the same reason as above, it is effective for products such as cosmetics and medicine that place importance on design, or for various cosmetic boxes and packages that require a high-class feeling.

5. It can be read with the phosphor mark (latent image mark) even in an environment where the conventional reflective barcode cannot be used because it is contaminated by oil or dust at the factory or on site.

6. The above 1. And 3. For the same reason as above, distribution information, slip management, delivery slip to the customer (delivery slip usually contains the paper specified by the customer, only the information required by the customer in the format) is managed as a hidden code by the manufacturer. Can be inserted.

7. Information can be inserted into a card-like object as a hidden code and used as a game card (bar code game). In particular, the hidden cord can be made completely invisible by providing a hiding layer or a laminate layer.

8. The above 1. And 3. For the same reason as above, if it is used as a book management or a book management, the design is not damaged.

9. Forgery, alteration, and tampering are extremely difficult, so entry / exit management, time and attendance management (time recorder),
It can be applied to hotel key cards.

10. Counterfeiting or alteration of securities or stock certificates,
Tampering can be prevented.

11. It can prevent counterfeiting, falsification and tampering of credit cards, cash cards, telephone cards, etc.

12. Prevents forgery, alteration, and falsification of student ID cards, ID cards, etc., and also enables downsizing and space saving.

13. Forgery, alteration, and falsification of stamp cards, point cards, etc. can be prevented, and downsizing and space saving are possible.

14. It is possible to prevent counterfeiting, alteration, and falsification of betting tickets such as betting tickets and car tickets.

15. It can be introduced into a pachinko prize exchange system to prevent forgery, alteration, and tampering.

[0056]

According to the invention described in claim 1, since the vicinity of the through hole portion of the slit sheet is covered by one end surface of the sheet pressing member, it is possible to eliminate reflected light from this portion, As a result, S / N can be improved and reading reliability can be improved.

According to the second aspect of the invention, since the other end surface of the sheet pressing member covers the light emitting element and the light emitting section of the light receiving element, and the end surface excluding the light receiving section, the reading reliability is further increased. be able to.

According to the third aspect of the invention, since the sheet pressing member also serves as the element holder for holding the light emitting element and the light receiving element, the size and simplification of the entire apparatus can be achieved.

According to the invention described in claim 4, since the portion other than the through hole portion of the slit sheet is formed of the opaque layer, the light reflection preventing effect in this portion can be further enhanced.

According to the fifth aspect of the invention, the fluorescent substance mark can be accurately read.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a bar code reader including an optical reading device.

FIG. 2 is an exploded perspective view of the optical reading device according to the embodiment of the present invention.

FIG. 3 is a front sectional view of an optical reading device according to an embodiment of the present invention.

FIG. 4 is a side sectional view of the optical reading device according to the embodiment of the present invention.

FIG. 5 is a plan view of the optical reading device according to the embodiment of the present invention with the head cover removed.

FIG. 6 is a front view of the head cover.

FIG. 7 is a side view of the head cover.

FIG. 8 is a bottom view of the head cover.

FIG. 9 is a front view of a sheet pressing member.

FIG. 10 is a side sectional view of a sheet pressing member.

FIG. 11 is a plan view of a sheet pressing member.

FIG. 12 is a bottom view of the sheet pressing member.

FIG. 13 is a plan view showing an example of a slit sheet.

FIG. 14 is a plan view showing another example of the slit sheet.

FIG. 15 is a front view showing a state in which a slit sheet made of a thin metal plate is curved as in actual use.

FIG. 16 is a front view of the optical head main body.

FIG. 17 is a front sectional view of the optical head main body.

FIG. 18 is a plan view of the optical head body.

FIG. 19 is a bottom view of the optical head body.

FIG. 20 is a schematic plan view of an optical reading device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Head cover 11 Leg part 12 Engaging claw 13 Pushing pin 20 Light emitting element 21 Light receiving element 30 Sheet pressing member 31, 32 Holder part 33 Light regulating hole 34 Engaging piece 40 Sliding sheet 41 Light transmitting part 42 Positioning hole 50 Optical head body 51 ear One piece 52 Mounting hole 53 Engagement recess 54 Engagement groove 55 Positioning pin 56 Reading opening

Claims (5)

[Claims] 1. A slit sheet having an optical head body having a reading opening and a slit-shaped light transmitting portion, the slit sheet being disposed near the reading opening of the optical head body, and a light transmitting portion of the slit sheet. A light-emitting element that irradiates the object to be detected with light through the reading opening of the optical head body, and a light-receiving element that receives light from the object to be detected from the reading opening of the optical head body through the light transmitting part of the slit sheet. In the optical reading device having, a sheet pressing member made of an opaque material for pressing the slit sheet near the reading opening on the inner surface of the optical head body is provided, and the sheet pressing member corresponds to the light transmitting portion of the slit sheet. The sheet has a light regulating hole, and the other of the light regulating holes corresponds to the light emitting portion of the light emitting element and the light receiving portion of the light receiving element. An optical reading device characterized in that the vicinity of a light-transmitting portion of a slit sheet is covered by one end face. 2. The end surface of the light emitting element excluding the light emitting portion and the end surface of the light receiving element excluding the light receiving portion are covered by the other end surface of the sheet pressing member. Optical reading device. 3. The optical reading device according to claim 1, wherein the sheet pressing member also serves as an element holder that holds the light emitting element and the light receiving element. 4. The slit sheet according to claim 1, comprising a transparent base film and an opaque layer printed on the surface of the base film, and a portion where the opaque layer is not printed is a light-transmitting portion. An optical reading device characterized by being connected. 5. The optical reading device according to claim 1, wherein the detected object has a phosphor mark.