JPH06187480A - Optical information reader - Google Patents

Abstract

PURPOSE:To save power consumption by positively and effectively utilizing external light such as natural light as much as possible when reading optical information in the optical information reader. CONSTITUTION:The degree of light transmission at a liquid crystal panel 20 is set to a target light transmission degree, and the degree of light emission at a light source 30 is set to zero. When the light quantity made incident on a bar code Bc can be properly secured with the light quantity transmitted through the liquid crystal panel 20, the bar code Bc is read as bar code data only with the light quantity transmitted through this liquid crystal panel 20. When the light quantity made incident on the bar code Bc can not be properly secured only with the light quantity transmitted through the liquid crystal panel 20 because of the lack of external light, the bacr code Bc is read while properly securing the light quantity made incident on the bar code Bc with the total light quantity of the sum of the light quantity transmitted through the liquid crystal panel 20 and the light quantity emitted from the power source 30 by increasing the degree of light emission at the light source 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information reader, and more particularly to a portable or stationary optical information reader suitable for reading optical information such as bar codes.

[0002]

2. Description of the Related Art Conventionally, for example, in a touch-type portable bar code reader, a part of a peripheral wall of a casing is provided in the vicinity of a reading port of the casing, as disclosed in Japanese Patent Application Laid-Open No. 3-233783. The bar code is made of a light control material that changes its transmission state depending on the incident angle of external light so that the position of the bar code can be visually recognized from above the casing while diffusing the ambient light, and the bar code is passed through the reading port from the light source inside the casing. To the mirror inside the casing through the reading port, and the reflected light from this mirror is properly imaged on the image sensor through the condenser lens. There are some that are designed to read barcodes based on.

[0003]

However, in such a structure, normally, each time the bar code is read,
Since a large amount of power is required to make the light source emit light,
This has been a factor that hinders the power saving of the barcode reader. For example, generally, the current consumption during continuous light emission of the light source reaches 5 to 60 (mA), and the power consumption is around 0.3 (W). Therefore, if the bar code reader is of a type that has a built-in power supply battery, the battery life will be extremely short.

On the other hand, it is possible to utilize external light such as natural light as light for reading a bar code. However, a part of the peripheral wall of the casing configured by the above-mentioned light control material is for preventing the adverse effect on the reading of the bar code by diffusing the outside light, and utilizing the outside light. It is not designed to read barcodes.

Therefore, in order to cope with such a situation, the present invention saves power by actively utilizing outside light such as natural light in reading optical information in an optical information reading device. It is something to try.

[0006]

In order to solve the above-mentioned problems, in the present invention, a casing and a light emission amount corresponding to a light emission degree directed to an optical medium through a reading port of the casing are provided. And a light source that emits light
An image sensor disposed in the casing for receiving light reflected from the optical medium through the reading port; a reading unit for reading optical information of the optical medium based on a light reception result of the image sensor; The optical information reading device provided with the light source and the power source for supplying power to the image sensor is characterized by being configured as follows.

That is, the structural feature of the present invention is that it is fitted in an appropriate position on the peripheral wall of the casing to allow external light to be transmitted with an amount of transmitted light according to the degree of light transmission and to be incident on the optical medium through the reading port. In order to maintain a total amount of light emitted from the light source and the amount of transmitted light of the light collecting element within a readable appropriate light quantity range of the optical medium,
A control means for controlling the light transmission degree of the lighting element and the light emission degree of the light source is provided so as to reduce the light emission amount and increase the transmitted light amount.

[0008]

With the above-described structure of the present invention, the control means controls the amount of light emitted from the light source and the amount of the light-collecting element under the power supply from the power source to the light source and the image sensor. By controlling the light transmission degree of the lighting element and the light emission degree of the light source so as to increase the transmitted light amount and decrease the emitted light amount in order to maintain the total amount of transmitted light within the proper light amount range, the reading port The amount of light incident on the optical medium through the optical medium is maintained within the proper amount range. Therefore, the reading unit can accurately read the optical medium based on the light reception result of the image sensor with respect to the amount of reflected light from the optical medium. In such a case, as described above, the light transmission degree of the daylighting element and the light emission degree of the power source are controlled so as to reduce the light emission quantity of the light source and increase the transmitted light quantity of the daylighting element, so that external light is effectively utilized. By doing so, it becomes possible to read the optical medium while saving the power of the power source.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a touch type portable optical information reading device according to the present invention. This optical information reading device has a casing 10, and this casing 10
At the reading tip side of the bent portion 10a of the
Is formed in a rectangular shape so as to face the barcode Bc. Further, in the opening 12 formed in the upper wall of the bent portion 10a of the casing 10 located near the reading port 11,
A liquid crystal panel 20 is fitted to form a daylighting window, and the liquid crystal panel 20 has an inner surface on which the bent portion 1 is formed.
Bar code Bc through the inside of 0a and the reading port 11
(See the arrow with the symbol N in FIG. 1). The liquid crystal panel 20 is
External light such as natural light is transmitted from the outer surface side to the inner surface side, and is incident on the barcode Bc through the inside of the bent portion 10a and the reading port 11. In such a case, the degree of light transmission of the liquid crystal panel 20 changes in proportion to the voltage applied to the liquid crystal panel.

In the casing 10, the light source 30,
A mirror 40, a condenser lens 50, a line type image sensor 60, and a power source 70 are arranged. The light source 30 is located inside the bent portion 10a of the casing 10 so as to correspond to the liquid crystal panel 20, and the light source 30 has a plurality of built-in light emitting diodes arranged in a line in the longitudinal direction thereof. From the diode through the reading port 11
At the bar code B, the light is emitted in a line as shown in
It is designed to be incident on c. In such a case, light is incident on the barcode Bc by bringing the reading port 11 into contact with the barcode Bc.

The mirror 40 is a bent portion 1 of the casing 10.
The mirror 40 is arranged within the boundary between the gripping portion 10b and the gripping portion 10a, and the mirror 40 reflects the reflected light from the barcode Bc through the reading port 11 and reflects it toward the condenser lens 50. The condenser lens 50 is used for the grip portion 10 of the casing 10.
In FIG. 2b, the image sensor 60, the power source 70, and the signal processing circuit E shown in FIG. 2 are provided on the substrate 80. The condenser lens 50 condenses the reflected light from the mirror 40 and the image sensor. The bar code Bc is made incident on the image sensor 60 to form an image on the image sensor 60. The image sensor 60 is composed of a CCD or the like arranged in a line parallel to the longitudinal direction of the mirror 40. The image sensor 60 converts an image representing a barcode from the condenser lens 50 into an electric signal. Occurs. In such a case, the level of the electrical conversion signal from the image sensor 60 changes in proportion to the amount of light incident on the image sensor 60, and is saturated by increasing the amount of incident light above a predetermined amount of incident light.

The power supply 70 is composed of a battery, and the power supply 70 supplies electric power to each electric element on the substrate 80 and the image sensor 60. A trigger switch mechanism 90 is attached to an intermediate portion of one side wall of the casing 10. The trigger switch mechanism 90 includes a trigger lever 91 and a self-returning normally-open trigger switch 9
2 and. Then, the trigger switch mechanism 90 generates a trigger signal necessary for starting the reading operation by temporarily closing the trigger switch 92 by the pushing operation of the trigger lever 91.

The signal processing circuit E, as shown in FIG.
It has a binarization circuit 100, and this binarization circuit 100
Converts the electrical conversion signal from the image sensor 60 into binary data and outputs it to the microcomputer 110. The microcomputer 110 executes the computer program in cooperation with the image sensor 60, the binarization circuit 100 and the trigger switch 92 according to the flowcharts shown in FIGS. 3 and 4, and during this execution, decodes the barcode Bc. And the liquid crystal drive circuit 120 and the light source drive circuit 130 connected to the liquid crystal panel 20 and the light source 30, respectively. However, the above computer program is stored in advance in the ROM of the microcomputer 110. In addition, the microcomputer 110
Is a power source 70 when a power switch (not shown) is turned on.
The computer program starts to be executed in response to the power supply from the computer.

In the first embodiment constructed as described above, in order to read the bar code Bc, the operator holds the grip portion 10b of the casing 10 to bring the reading port 11 into contact with the bar code Bc, and When the power switch is turned on, the microcomputer 110 starts executing the computer program in step 200 according to the flowcharts of FIGS. 3 and 4, and then executes step 2
At 01, initialization processing is performed. Next, in step 202, the microcomputer 110 causes the liquid crystal panel 20
The light transmission degree Hout of is set to the target light transmission degree Houto and is output to the liquid crystal drive circuit 120 as a liquid crystal drive signal, and in the next step 203, the light emission degree Hin of the light source 30 is set to zero and the light source is used as a light emission drive signal. Output to the drive circuit 130.

However, the light transmission degree Hout is determined by the liquid crystal panel 2
0 represents the degree to which external light such as natural light is transmitted from the outer surface side to the inner surface side. Further, the target light transmission degree Houto is the barcode Bc in the non-saturated state of the image sensor 60.
Is stored in advance in the ROM of the microcomputer 110 in correspondence with the readable optimum amount of transmitted light. Also,
As described above, the light transmission degree Hout of the liquid crystal panel 20 is set to the target light transmission degree Houto in step 202, and the light emission degree Hin of the light source 30 is set to zero in the next step 203. This is because the power saving of the power source 70 can be realized as much as possible by effectively utilizing outside light such as natural light.

The liquid crystal panel 20 is driven by the liquid crystal drive circuit 120 based on the liquid crystal drive signal from the microcomputer 110, and the light transmission degree Hout thereof becomes the target light transmission degree Houto. Therefore, the optimum amount of transmitted light that can read the barcode Bc when the image sensor 60 is in a non-saturated state can be transmitted through the liquid crystal panel 20. On the other hand, the light source 30 is driven based on the light emission drive signal from the microcomputer 110, and the light emission degree H
set in to zero. Therefore, the light emission amount of the light source 30 is maintained at zero. At this stage, if the amount of outside light such as natural light is sufficient, the light transmission degree Hou of the liquid crystal panel 20 is increased as described above.
Since t is the target light transmission degree Houto, the liquid crystal panel 20 transmits the outside light by an appropriate amount of light corresponding to the target light transmission degree Houto and makes it incident on the barcode Bc through the reading port 11. Then, the reflected light from the barcode Bc enters the casing 10 through the reading port 11 and is reflected by the mirror 40, and the condenser lens 50
It is collected by and is incident on the image sensor 60. Therefore, the image sensor 60 outputs the light amount of the same incident light as an electrical conversion signal.

Therefore, the microcomputer 110
However, in step 204, the electric conversion signal is input from the image sensor 60, and in the next step 205, the level of the electric conversion signal is digitally converted into the amount of light, and the computer program proceeds to step 210. However,
At this stage, since the amount of transmitted light of the liquid crystal panel 20 is an appropriate amount of light as described above, the microcomputer 11
0 determines “YES” in step 210, and advances the computer program to step 220. However,
The predetermined light amount range in step 210 corresponds to a light amount range in which the barcode Bc can be properly read in the non-saturated state of the image sensor 60, and is stored in the ROM of the microcomputer 110 in advance. At this time, if the trigger signal is generated from the trigger switch 92, the microcomputer 110 determines “YES” in step 220 based on the determination that the reading operation has started.

Then, the microcomputer 110
In step 221, the luminous intensity Hin of the light source 30 is set so that the incident light amount on the barcode Bc is maintained at the proper light amount.
Is set to zero, the light transmission degree Hout of the liquid crystal panel 20 is fixed to the target light transmission degree Houto, and in step 222,
The target light transmittance Houto is output as a liquid crystal drive signal. Then, in a state where the light emission amount from the light source 30 is zero, the liquid crystal panel 20 transmits the outside light by an appropriate light amount corresponding to the target light transmission degree Houto, and transmits the barcode Bc through the reading port 11 as described above. Incident on.

The reflected light from the bar code Bc enters the casing 10 through the reading port 11, is reflected by the mirror 40, is condensed by the condenser lens 50, and is incident on the image sensor 60. Therefore, the image sensor 60 outputs the light amount of the same incident light as an electrical conversion signal. Then, the binarization circuit 100 binarizes the electrical conversion signal and outputs it to the microcomputer 110 as binarized data. Therefore, the microcomputer 110 receives the binarized data from the binarization circuit 100 in step 223, and the binary data is input in step 224.
Based on the binarized data, the widths of the bar portion and the space portion of the bar code Bc are measured and digitized, the bar code Bc is decoded, and the decoded data is output in step 225.

On the other hand, when the computer program proceeds to step 210 as described above, if the light amount in step 205 is not within the predetermined light amount range, the microcomputer 110 determines in step 210 that the amount of outside light is If it is judged to be insufficient, it is determined to be "NO", and in the next step 206, the light amount difference between the appropriate light amount and the light amount in step 205 is calculated as the insufficient light amount, and step 20
7, the light source 3 up to the light emission degree corresponding to the same calculation insufficient light quantity
The light emission degree Hin of 0 is increased and the light emission drive signal is output to the light source drive circuit 130. Then, the light source 30 is driven by the light source drive circuit 130 based on the light emission drive signal from the microcomputer 110, and the increased light emission level Hin
It emits light with the amount of light corresponding to.

Therefore, the amount of light incident on the barcode Bc from the reading port 11 is specified by the total amount of light transmitted through the liquid crystal panel 20 and the amount of light emitted from the light source 30. Therefore, the reflected light from the bar code Bc is incident on the image sensor 60 and converted into an electric conversion signal by the total light amount in the same manner as described above, is input to the microcomputer 110 in step 204, and is converted into the light amount in step 205. Digitally converted. If the converted light quantity is not within the predetermined light quantity range, the determination in step 210 is “NO”.

Thereafter, if the determination in step 210 becomes "YES" during the repetition of the calculation that repeats steps 206 to 210, the microcomputer 110
Advances the computer program to step 220. Then, when the determination in step 220 is “YES” as in the above, the microcomputer 11
0 fixes the amount of light incident on the bar code Bc to the latest total amount of light in step 205 in step 221.
In step 222, the target light transmittance Houto of the liquid crystal panel 20 is output as a liquid crystal drive signal, and in step 2
The light emission intensity Hin of the light source 30 corresponding to the difference between the fixed total light amount in 21 and the actual transmitted light amount in the target light transmission degree Houto of the liquid crystal panel 20 (that is, equal to the light amount corresponding to the latest insufficient light amount in step 206) is set. It is output as a light emission drive signal.

Then, the liquid crystal panel 20 is driven by the liquid crystal drive circuit 120 based on the liquid crystal drive signal from the microcomputer 110 to attain the target light transmittance Houto, while the light source 30 is driven by the light emission drive signal from the microcomputer 110. It is driven to have the light emission degree Hin in step 222. Therefore, when the amount of outside light is insufficient, the amount of light emitted from the light source 30 is compensated for by the amount of light corresponding to the above-described amount of insufficient light, and the barcode Bc
The amount of light incident on is properly controlled. Therefore, on the assumption that the amount of light incident on the barcode Bc is properly controlled, the steps 223 to 223 are performed based on the binarized data output from the binarization circuit 100 via the image sensor 60 as described above. At 225, the barcode Bc is decoded and output.

As described above, the light transmission degree Hout of the liquid crystal panel 20 is set to the target light transmission degree Houto, and the light emission degree Hin of the light source 30 is set to zero. When the amount of incident light on Bc can be properly secured, the barcode Bc is read as the barcode data only by the amount of transmitted light of the liquid crystal panel 20. On the other hand, when the amount of light incident on the barcode Bc cannot be properly secured only by the amount of light transmitted through the liquid crystal panel 20 due to lack of external light, the light source 30
The luminous intensity Hin of the bar code Bc is increased by increasing the amount of light transmitted through the liquid crystal panel 20 and the total amount of light emitted from the power source 30 to properly secure the amount of light incident on the bar code Bc.
To read. Therefore, when reading the bar code Bc, the amount of light emitted from the power source 70 is suppressed as much as possible by fully utilizing the outside light such as natural light from the liquid crystal panel 20, and as a result, the power source 70 is saved while the bar power is being saved. The code Bc can be properly read.

In the first embodiment, the light transmission light amount Hout of the liquid crystal panel 20 is set to the target light transmission light amount Houto in step 202, and the step 20
In step 3, the light emission degree Hin of the light source 30 is set to zero, and only when the external light such as natural light is insufficient, the light emission degree Hin of the light source 30 is set.
The amount of incident light on the bar code Bc is increased by increasing the value of Step 2 instead of Step 2.
In step 02, the light transmission degree Hout of the liquid crystal panel 20 is set to the minimum, and in step 203 the light emission degree Hin of the light source 30 is set to the maximum, and the light transmission of the liquid crystal panel 20 is set within the range in which the image sensor 60 is not saturated. The light intensity Hout may be increased while the light emission degree Hin of the light source 30 may be decreased to save the power of the power source 70 and ensure the appropriate incident light amount to the barcode Bc.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. In the second embodiment, the image sensor 60 and the microcomputer 110 described in the first embodiment will be described. As shown in FIG. 5, a sensor drive circuit 60a and a clock circuit 60b are connected between the two, and the flowcharts shown in FIGS. 6 and 7 are adopted instead of the flowcharts of FIGS. 3 and 4. The computer program according to the above (hereinafter referred to as the second computer program) is stored in the ROM of the microcomputer 110 in advance in place of the computer program in the first embodiment.

The clock circuit 60b outputs a clock pulse at one of the predetermined high frequency HF and the predetermined low frequency LF under the switching control of the microcomputer 110. However, the high frequency HF clock pulse is used for the reading operation of the barcode Bc, while the low frequency LF clock pulse is used for the light amount control described later. In such a case, the low frequency LF is set considerably lower than the high frequency HF. The sensor drive circuit 60a repeatedly drives the image sensor 60 in response to the low-frequency LF or high-frequency HF clock pulse from the clock circuit 60b, and causes the image sensor 60 to output an electrical conversion signal. However, the power consumption of the image sensor 60 is
The lower the driving frequency of, the lower. The other structure is similar to that of the first embodiment.

In the second embodiment thus constructed, as in the first embodiment, in order to read the bar code Bc, the reading port 11 of the casing 10 is brought into contact with the bar code Bc and the power switch is turned on. If input, the microcomputer 110 starts executing the second computer program in step 300 according to the flowcharts of FIGS. 6 and 7, and then executes step 301.
Initialize with.

Then, the microcomputer 110
In step 302, the frequency of the clock pulse of the clock circuit 60b is set to the low frequency LF and the clock circuit 6
Output to 0b. Therefore, the clock circuit 120 outputs a clock pulse at the same low frequency LF, and in response to this, the sensor drive circuit 60a drives the image sensor 60 at the low frequency LF.

After the arithmetic processing in step 302, the microcomputer 110 starts an interval timer (built in the microcomputer 110) in step 303. For this reason, the interval timer alternately repeats the interval operation in which the interval timer measures time for a predetermined short time and pauses for a predetermined long time. Then, the microcomputer 110 executes the step 30.
At 4, the pulse drive signal for driving the light source 30 to perform pulsed light emission is output for each of the predetermined short times, and in response thereto, the light source drive circuit 130 drives the light source 30 to perform pulsed light emission. As a result, the light source 30 emits light in pulses for each of the short time periods. In addition, the microcomputer 110
In step 305, the liquid crystal panel 20 is driven to the target light transmission degree Houto through the liquid crystal drive circuit 120 in synchronization with the pulse emission drive of the light source 30. As a result, the liquid crystal panel 2
External light passing through 0 is incident on the barcode Bc together with pulsed light emission from the light source 30, and the reflected light is received by the image sensor 60 at a low frequency LF, and is output as a pulsed electrical conversion signal from the image sensor 60. Is output.

Then, the microcomputer 110
In step 306, the electric conversion signal is input from the image sensor 60, in step 307, the level of the electric conversion signal is digitally converted into the amount of light, and in step 308,
The light amount difference between the readable appropriate light amount of the barcode Bc and the converted light amount is calculated as the insufficient light amount. At this stage, if the trigger signal is generated from the trigger switch 92,
The microcomputer 110 determines “YES” in step 310, and advances the second computer program to step 311. Then, this step 311
In step 1, the microcomputer 110 fixes the amount of light incident on the bar code Bc to the proper amount of light, sets the frequency of the clock pulse of the clock circuit 60b to the high frequency HF in step 312, and outputs it to the clock circuit 60b. Therefore, the clock circuit 120 has the same high frequency H
A clock pulse is output at F, and in response thereto, the sensor drive circuit 60a causes the image sensor 60 to operate at high frequency HF.
To drive.

After the arithmetic processing in step 312, the microcomputer 110, in step 313, sets the light transmittance Hout of the liquid crystal panel 20 to the target light transmittance Houto.
Then, in step 314, the light emission degree Hin of the light source 30 is set to the light emission degree corresponding to the insufficient light amount in step 308. In this case, if the amount of outside light is sufficient, the appropriate light amount is reached only by the amount of light transmitted through the liquid crystal panel 20, so that the light emission degree Hin of the power source 30 becomes zero.
If the external light is insufficient, the light amount difference from the appropriate light amount and the converted light amount (that is, the actual transmitted light amount) is compensated by the light emission amount from the power source 30. Therefore, the light emission degree Hin corresponding to this supplementary light emission amount is set to the light emission degree of the power supply 30.

Then, the microcomputer 110
However, in step 315, the liquid crystal drive signal necessary for driving the liquid crystal panel 20 at the target light transmission degree Houto is generated, and the power source 30 is set to the light emission degree H in step 314.
Generates a light emission drive signal required for continuous light emission drive at in. Then, the liquid crystal panel 20 causes the liquid crystal drive circuit 120 to operate based on the liquid crystal drive signal from the microcomputer 110.
The target light transmission degree is Houto, and the power source 30 is continuously driven to emit light based on the light emission drive signal from the microcomputer 110. Therefore, the external light transmitted through the liquid crystal panel 20 and the light emitted from the light source 30 enter the barcode Bc through the reading port 11. Bar code B
When the reflected light from c is received by the image sensor 60 at high frequency HF and is output as an electrical conversion signal, 2
The binarization circuit 100 binarizes the electrical conversion signal and outputs it as binarized data, and the microcomputer 110 decodes the bar code Bc and outputs it in steps 316 and 317 as in the first embodiment. To do.

As described above, the image sensor 60
Under low frequency LF, the light source 30 and the liquid crystal panel 20 are pulse-driven for each predetermined short time, and the light amount difference between the appropriate light amount and the digitally converted light amount of the output of the image sensor 60 is calculated as the insufficient light amount. LCD panel 2
The bar code Bc is read by compensating the shortage of the actual transmitted light amount of 0 from the appropriate light amount, that is, the calculated insufficient light amount with the light emission amount from the light source 30. Therefore, when reading the bar code Bc, the amount of light emitted from the power source 30 is suppressed as much as possible by fully utilizing the external light such as natural light from the liquid crystal panel 20.
It is possible to properly read the barcode Bc while achieving power saving. In such a case, the calculation of the amount of insufficient light prior to reading the barcode Bc is performed by the image sensor 60.
Since the driving frequency of the light source is low frequency LF and the light source 30 is driven by pulsed light emission, the power consumption of the power source 70 can be suppressed to the minimum. Further, the time delay of the calculation of the insufficient light amount prior to the reading of the bar code Bc is constantly performed at the light receiving timing of the low frequency LF of the image sensor 60, and thus is suppressed to the minimum.

Further, in the practice of the present invention, an example in which the present invention is applied to a touch type portable optical information reading device has been described, but instead of this, a non-contact type portable optical information reading device or a stationary optical information reading device. The present invention may be applied to an information reading device and implemented.

In carrying out the present invention, the present invention may be applied to read various optical information media, not limited to bar codes.

Further, in carrying out the present invention, not only the case of forming the lighting window by the liquid crystal panel 20, but, for example,
You may implement so that a lighting window may be comprised by various lighting elements, such as a Kar cell.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a block circuit diagram in the first embodiment.

FIG. 3 is a front part of a flowchart showing the operation of the microcomputer of FIG.

FIG. 4 is a latter part of the flowchart.

FIG. 5 is a block diagram of essential parts in a second embodiment of the present invention.

6 is a front part of a flowchart showing the operation of the microcomputer of FIG.

FIG. 7 is a latter part of the flowchart.

[Explanation of symbols]

10 ... Casing, 20 ... Liquid crystal panel, 30 ... Light source, 6
0 ... Image sensor, 70 ... Power supply, 110 ... Microcomputer.

Claims (1)

[Claims] 1. A casing, a light source which is disposed in the casing and which emits light with a light emission amount corresponding to a light emission degree toward an optical medium through a reading port of the casing, and the light source which is disposed in the casing. An image sensor that receives light reflected from the optical medium through the reading port, a reading unit that reads optical information of the optical medium based on a light reception result of the image sensor, the light source and the image that are disposed in the casing. In an optical information reading device equipped with a power supply for supplying power to a sensor, the optical medium is fitted into an appropriate position of a peripheral wall of the casing, transmits external light with an amount of transmitted light according to a degree of light transmission, and enters the optical medium through the reading port. And a total of the amount of light emitted from the light source and the amount of transmitted light of the light collecting element is read by the optical medium. Control means for controlling the light transmission degree of the daylighting element and the light emission degree of the light source so that the emitted light amount is reduced and the transmitted light amount is increased in order to maintain the light amount within an appropriate range of appropriate light amount. An optical information reading device characterized by: