CN107016308B - Optical information reading apparatus - Google Patents
Optical information reading apparatus Download PDFInfo
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- CN107016308B CN107016308B CN201610809838.4A CN201610809838A CN107016308B CN 107016308 B CN107016308 B CN 107016308B CN 201610809838 A CN201610809838 A CN 201610809838A CN 107016308 B CN107016308 B CN 107016308B
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- Prior art keywords
- marker light
- light
- optical axis
- marker
- imaging range
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10554—Moving beam scanning
- G06K7/10594—Beam path
- G06K7/10683—Arrangement of fixed elements
- G06K7/10702—Particularities of propagating elements, e.g. lenses, mirrors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
Abstract
The invention provides an optical information reading device, which can reduce the deviation between the center of a marking light and the center of an imaging range without hindering miniaturization. The marker light irradiation unit (22) is provided at a position farther than the reflecting mirror (24) with respect to the reading port (13), and is arranged so that the optical axis (Lgm) of the marker light (Lm) is parallel to the optical axis (Lgr) that is the center of the imaging range of the light receiving sensor (23), and the marker light (Lm) is brought closer to the upper edge (24U) of the reflecting mirror (24).
Description
Technical Field
The present invention relates to an optical information reading apparatus for optically reading an information code or the like.
Background
Conventionally, when an information code such as a barcode or a QR code (registered trademark) is optically read, a reading target to which the information code is attached is irradiated with a marker light indicating the center of an imaging range, thereby facilitating reading of the information code. However, in the case where the center of the imaging range is indicated by the marker light, there is a problem that a slight deviation occurs between the center of the actual imaging range and the center of the marker light. The smaller the distance between the reading object and the reading device, the more significant the problem. One of the reasons for this problem is that when the optical axis of the marker light is to be brought close to the optical axis that is the center of the imaging range, the light receiving sensor and the marker light source need to be arranged at a distance from each other depending on the size of the light receiving sensor and the marker light source and the area required for mounting the light receiving sensor and the marker light source.
To solve this problem, an optical information reading apparatus disclosed in, for example, patent document 1 below is known. In the optical information reading apparatus, two marker optical systems are respectively provided on both sides of a light receiving sensor, and the light receiving sensor is arranged between a right marker optical system and a left marker optical system and on a virtual line connecting an optical axis of the right marker light and an optical axis of the left marker light. Accordingly, the center axis of the center of the entire marker light including the right marker light and the left marker light can be aligned with the light receiving axis of the light receiving sensor, and therefore, the readable range and the reading center position thereof can be accurately and clearly displayed regardless of the distance between the reading port and the reading target.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-020722
Disclosure of Invention
Technical problem to be solved by the invention
However, in the configuration requiring a plurality of marker light irradiation portions (marker light sources) as described above, there is a problem that not only the manufacturing cost is increased due to an increase in the number of parts, but also two marker optical systems need to be arranged on both sides of the light receiving sensor, and therefore, it is difficult to miniaturize the reading apparatus.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical information reading apparatus capable of reducing a deviation between a center of a marker light and a center of an imaging range without hindering miniaturization.
Means for solving the technical problem
To achieve the above object, a first invention of the present application is characterized by comprising: a light receiving sensor (23) capable of capturing an image of the information code (C); a reflecting mirror (24, 24a) that reflects reflected light (Lr) from the information code via a reading port (13) toward the light receiving sensor; an imaging lens (25) for condensing the light reflected by the mirror and imaging the light on the light receiving sensor; and a marker light irradiation unit (22) that irradiates marker light (Lm) indicating the center of the imaging range of the light receiving sensor; the marker light irradiation section is provided at a position farther than the mirror with respect to the reading port, and is arranged so that an optical axis (Lgm) of the marker light is parallel to an optical axis (Lgr) that is the center of an imaging range of the light receiving sensor, and the marker light is close to an outer edge of the mirror.
In addition, a second invention of the present application is characterized by comprising: a light receiving sensor (23) capable of capturing an image of the information code (C); an imaging lens (25) that condenses reflected light (Lr) from the information code and forms an image on the light-receiving sensor; a marker light irradiation unit (22, 61, 71) that irradiates marker light (Lm) indicating the center of the imaging range of the light receiving sensor; and reflection elements (51, 64, 72) that reflect the marker light irradiated from the marker light irradiation section toward an imaging range of the light receiving sensor; the reflection element is arranged outside the imaging range of the light receiving element and close to the imaging lens as follows: an optical axis (Lgm) of the reflected marker light is parallel to and close to an optical axis (Lgr) that is the center of the imaging range of the light receiving sensor.
In addition, the reference numerals in parentheses above indicate correspondence with specific elements described in the embodiments described later.
ADVANTAGEOUS EFFECTS OF INVENTION
In the first invention of the present application, the marker light irradiation section is provided at a position farther than the reflecting mirror with respect to the reading port, and is arranged so that the optical axis of the marker light is parallel to the optical axis which is the center of the imaging range of the light receiving sensor, and the marker light is made to be close to the outer edge of the reflecting mirror. This eliminates the influence of the size of the light receiving sensor and the marker light irradiating section, the area required for mounting the light receiving sensor and the marker light irradiating section, and the like on the distance between the optical axis of the marker light and the optical axis that is the center of the imaging range. That is, since the marker light passes near the outer edge of the mirror, the distance between the optical axis of the marker light and the optical axis that is the center of the imaging range is determined by the size of the mirror, and therefore, the deviation between the center of the marker light and the center of the imaging range can be reduced without hindering the miniaturization of the optical information reading device.
According to a preferable example of the first invention, the marker light irradiating section is configured to make the marker light approach an edge portion of an outer edge of the mirror which is close to the imaging lens. Accordingly, the marker light is irradiated closer to the substrate surface on which the light receiving sensor is mounted than the optical axis which is the center of the imaging range, and therefore, the height of the optical system in the direction perpendicular to the substrate surface can be reduced, and further miniaturization of the optical information reading apparatus can be achieved.
According to another preferred embodiment of the first invention, since the entire surface of the reflecting surface is formed so as to coincide with the imaging range of the light receiving sensor, the size of the reflecting mirror can be reduced without changing the imaging range, and thus the deviation between the center of the marker light and the center of the imaging range can be further reduced.
According to still another preferred example of the first invention, the marker light irradiating section is mounted on the same substrate as the light receiving sensor, and is provided with a marker light reflecting mirror that reflects the marker light irradiated from the marker light irradiating section in the following manner: the optical axis of the marker light is made parallel to the optical axis which is the center of the imaging range of the light receiving sensor and close to the outer edge of the reflecting mirror. Thus, even if the marker light irradiation section and the light receiving sensor are mounted on the same substrate, the distance between the optical axis of the marker light and the optical axis which is the center of the imaging range is determined by the size of the mirror, and therefore, the deviation between the center of the marker light and the center of the imaging range can be reduced, and the optical information reading device can be further miniaturized.
In a second invention of the present application, a reflecting element that reflects marker light irradiated from the marker light irradiating section toward an imaging range of the light receiving sensor is provided, the reflecting element being arranged outside the imaging range of the light receiving sensor and close to the imaging lens in such a manner that: the optical axis of the reflected marker light is made parallel to and close to the optical axis that is the center of the imaging range of the light receiving sensor. This eliminates the influence of the size of the light receiving sensor and the marker light irradiating section, the area required for mounting the light receiving sensor and the marker light irradiating section, and the like on the distance between the optical axis of the marker light and the optical axis that is the center of the imaging range. That is, since the imaging range is narrow near the imaging lens, the reflection element is easily moved closer to the optical axis which is the center of the imaging range without falling within the imaging range, and therefore, the deviation between the center of the marker light and the center of the imaging range can be reduced without hindering the miniaturization of the optical information reading apparatus.
According to a preferred embodiment of the second invention, the reflecting element is configured as a collimating lens having an incident surface, an exit surface, and a reflecting surface for condensing and collimating the marker light according to a curvature provided on at least one of the incident surface and the exit surface, wherein the reflecting surface internally reflects the marker light incident from the incident surface to the exit surface as follows: the optical axis of the marker light incident from the incident surface is made parallel to the optical axis which is the center of the imaging range. Thus, the reflecting element has both a function as a collimating lens and a function as a reflecting lens for the marker light, and therefore, the marker light irradiating section does not need a collimating lens, the number of parts is reduced, and the optical information reading apparatus can be downsized.
According to another preferred embodiment of the second invention, the reflecting element is formed such that the curvature of the exit surface is larger than the curvature of the entrance surface. In the case of a lens having a plane incident surface and a curved exit surface, the distance from the position of the diaphragm in the marker light irradiation section to the curved surface is longer than that of a lens having a plane incident surface and a plane exit surface. That is, by forming the lens such that the curvature of the exit surface is larger than the curvature of the entrance surface, the position of the stop in the marker light irradiation section is equivalent to a case where the lens is located farther away than a case where the curvature of the exit surface is smaller than the curvature of the entrance surface. Even if the marker light is collimated and emitted, as long as the distance from the lens to the reading target and the diameter of the diaphragm in the marker light irradiation section are constant, the longer the distance from the position of the diaphragm to the lens, the smaller the spot diameter when the marker light is irradiated to the reading target, and the brighter the marker light. Therefore, by making the curvature of the exit surface larger than the curvature of the entrance surface, the spot diameter is reduced, and therefore the marker light can be made brighter, and the visibility of the marker light can be improved.
According to still another preferred embodiment of the second invention, a diffractive optical element that diffracts the marker light reflected inside the reflecting surface to form a predetermined pattern is provided on the emission surface of the reflecting element configured as a lens having the reflecting surface that internally reflects the marker light. Thus, even when the marker light formed in the predetermined pattern is irradiated so as to show the outer edge of the imaging range, the deviation between the center of the predetermined pattern that functions as the marker light and the center of the imaging range can be reduced.
Drawings
Fig. 1 is a block diagram schematically showing the configuration of an optical information reading apparatus according to a first embodiment.
Fig. 2 is a schematic diagram showing a positional relationship between the marker light irradiation section and the mirror in the first embodiment.
Fig. 3 is a schematic diagram showing a positional relationship between the marker light irradiation section and the mirror in the second embodiment.
Fig. 4 is a schematic diagram showing a positional relationship between the marker light irradiation section and the mirror in the third embodiment.
Fig. 5 is a schematic diagram illustrating a positional relationship between the marker light irradiation section and the mirror in the fourth embodiment.
Fig. 6 is a schematic diagram illustrating a positional relationship between the marker light irradiation section and the mirror in a modification of the fourth embodiment.
Fig. 7 is a schematic diagram showing a light receiving sensor and a positional relationship between a marker light irradiating section and a marker light reflecting mirror in the fifth embodiment.
Fig. 8 is a schematic diagram showing a positional relationship between the light receiving sensor and the marker light irradiating section and the marker light reflecting mirror in the fifth embodiment, as viewed from the Y axis direction with respect to fig. 7.
Fig. 9 is a schematic diagram showing a light receiving sensor and a positional relationship between a marker light irradiating section and a marker light lens in the sixth embodiment.
Fig. 10 is a schematic view showing a positional relationship between the light receiving sensor and the marker light irradiating section and the marker light lens in the sixth embodiment, as viewed from the Y axis direction with respect to fig. 9.
Fig. 11 is an enlarged cross-sectional view of the marker light lens of fig. 9.
Fig. 12A is a schematic diagram illustrating a state in which the marker light is collimated by the lens whose incident surface is a flat surface and whose emission surface is a curved surface, and fig. 12B is a schematic diagram illustrating a state in which the marker light is collimated by the lens whose incident surface is a curved surface and whose emission surface is a flat surface.
Fig. 13A is a schematic view illustrating the spot diameter of the marker light in the case where the aperture is located farther from the lens, and fig. 13B is a schematic view illustrating the spot diameter of the marker light in the case where the aperture is located closer to the lens.
Fig. 14 is a schematic diagram showing the light receiving sensor and the positional relationship between the marker light irradiating section and the marker light lens in the seventh embodiment.
Fig. 15 is a schematic view showing a positional relationship between the light receiving sensor and the marker light irradiating section and the marker light lens in the seventh embodiment, as viewed from the Y axis direction with respect to fig. 14.
Fig. 16 is an enlarged cross-sectional view of the marker light lens of fig. 14.
Description of the reference numerals
10: optical information reading apparatus
13: reading port
20 a: substrate
22: mark light irradiating part
23: light receiving sensor
24. 24 a: reflecting mirror
25: imaging lens
26: reflector for marker light
51: reflector for marking light (reflecting element)
61. 71: mark light irradiating part
64. 72: lens for marking light (reflection element)
65. 73: incident surface
66. 74: light exit surface
67. 75: reflecting surface
76: diffractive optical element
Lm: identification light
Lr: reflected light
Detailed Description
[ first embodiment ]
An optical information reading apparatus according to a first embodiment of the present invention will be described below with reference to the drawings.
The optical information reading device 10 of the present embodiment is configured as an information code reader that optically reads information codes such as one-dimensional codes and two-dimensional codes. Here, as the one-dimensional CODE, a so-called barcode composed of, for example, a JAN CODE, EAN, UPC, ITF CODE, CODE39, CODE128, NW-7, or the like is conceivable. Further, as the two-dimensional code, for example, a square-shaped information code such as a QR code, a data matrix code, a macbeth code, and an Aztec code is conceivable.
The optical information reading device 10 houses a circuit unit 20 (see fig. 2) in the housing 10A, and the circuit unit 20 mainly includes an optical system such as an illumination light source 21, a marker light irradiation unit 22, and a light receiving sensor 23, and a microcomputer (hereinafter, simply referred to as a "microcomputer") system such as a memory 35 and a control circuit 40.
The optical system is divided into a light projecting optical system and a light receiving optical system. The light projection optical system is composed of an illumination light source 21 and a marker light irradiation section 22. The illumination light source 21 functions as an illumination light source capable of emitting illumination light Lf, and is composed of, for example, an LED and a lens provided on the emission side of the LED. In fig. 2, the illumination light source 21 is not shown for convenience.
The marker light irradiation unit 22 functions as a marker light source capable of irradiating marker light Lm indicating the center of the imaging range of the light receiving sensor 23, and is configured by, for example, an LED and a lens provided on the emission side of the LED. Fig. 1 conceptually shows an example in which illumination light Lf and a beam-shaped marker light Lm are irradiated to a reading target R to which an information code C is attached.
The light receiving optical system includes a two-dimensional light receiving sensor 23, a rectangular mirror 24, an imaging lens 25, and the like. The light receiving sensor 23 is configured to be able to pick up an image of the information code C, for example, as an area sensor in which light receiving elements, which are solid-state image pickup elements such as C-MOS and CCD, are two-dimensionally arranged, and is configured to output an electric signal (that is, pick up an image) corresponding to the intensity of the reflected light Lr for each cell (pattern) of the received information code. As shown in fig. 2, the light receiving sensor 23 is mounted on the substrate 20a so as to be able to receive incident light that enters through the imaging lens 25.
As shown in fig. 2, the mirror 24 functions as follows: the reflected light Lr from the information code C, which is incident from the outside through the reading port 13 (a window for irradiating light and receiving light provided in a part of the housing 10A), is reflected toward the light-receiving sensor 23, and the mirror 24 is held by a holder (not shown) together with the imaging lens 25. In particular, in the present embodiment, the reflecting mirror 24 is configured to reflect the reflected light Lr toward the light receiving sensor 23 at a substantially right angle. Note that, in fig. 1, for convenience, the reflection direction of the reflected light Lr is schematically shown, and the mirror 24 is not shown.
The imaging lens 25 functions as an imaging optical system that condenses the light reflected by the mirror 24 and can form an image on the light receiving surface 23a of the light receiving sensor 23. In the present embodiment, the imaging lens 25 condenses the reflected light Lr from the information code C reflected by the mirror 24, and images the code image on the light receiving surface 23a of the light receiving sensor 23.
The microcomputer system is composed of an amplifier circuit 31, an a/D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, an operation section 42, a liquid crystal display 43, a buzzer 44, a vibrator 45, a light emitting section 46, a communication interface 48, and the like. The microcomputer system is configured mainly by a control circuit 40 and a memory 35 that can function as a microcomputer (information processing device), and can perform signal processing on an image signal of an information code captured by the optical system in a hardware system or a software system. The control circuit 40 also controls the entire system of the optical information reading apparatus 10.
An image signal (analog signal) output from the light receiving sensor 23 of the optical system is input to an amplifier circuit 31, amplified at a predetermined gain, input to an a/D converter circuit 33, and converted from an analog signal to a digital signal. Then, image data (image information) as a digitized image signal is generated and input to the memory 35, and further stored in a predetermined code image information storage area. The synchronizing signal generating circuit 38 is configured to be able to generate a synchronizing signal for the light receiving sensor 23 and the address generating circuit 36, and the address generating circuit 36 is configured to be able to generate a storage address of the image data to be stored in the memory 35 based on the synchronizing signal supplied from the synchronizing signal generating circuit 38.
The memory 35 is a semiconductor storage device, and for example, a RAM (DRAM, SRAM, etc.), a ROM (EPROM, EEPROM, etc.) corresponds to the memory 35. The RAM in the memory 35 can secure a work area and a read condition table to be used by the control circuit 40 for each process such as arithmetic operation and logical operation, in addition to the code image information storage area described above. In addition, the ROM stores in advance a reading program capable of executing a reading process for optically reading an information code, a system program capable of controlling each hardware such as the illumination light source 21 and the light receiving sensor 23, and the like.
The control circuit 40 is a microcomputer capable of controlling the entire optical information reading apparatus 10, and is configured by a CPU, a system bus, an input/output interface, and the like, and is capable of configuring an information processing apparatus together with the memory 35, and has an information processing function. The control circuit 40 functions as follows: the code image of the information code imaged by the light receiving sensor 23 and stored in the memory 35 is subjected to decoding processing (decoding). The control circuit 40 is configured to be connectable to various input/output devices (peripheral devices) via a built-in input/output interface, and in the present embodiment, is connected to an operation unit 42, a liquid crystal display 43, a buzzer 44, a vibrator 45, a light emitting unit 46, a communication interface 48, and the like.
The operation unit 42 is configured by a plurality of keys, and is configured to transmit an operation signal to the control circuit 40 in response to a key operation performed by a user, and the control circuit 40 is configured to operate in response to the operation signal when receiving the operation signal from the operation unit 42. The liquid crystal display 43 is formed of a known liquid crystal display panel, and the display content is controlled by the control circuit 40. The buzzer 44 is formed of a known buzzer, and is configured to generate a predetermined sound in response to an operation signal from the control circuit 40. The vibration unit 45 is formed of a known vibrator mounted on a mobile device, and is configured to generate vibration in accordance with a drive signal from the control circuit 40. The light emitting unit 46 is, for example, an LED, and is configured to be lit up in response to a signal from the control circuit 40. The communication interface 48 is configured as an interface for data communication with an external device (for example, a host device), and is configured to perform communication processing in cooperation with the control circuit 40.
Next, the positional relationship between the marker light irradiation section 22 and the mirror 24 will be described in detail with reference to fig. 2. In fig. 2 of the irradiation light and light receiving geometry, for the sake of explanation, the direction of the optical axis Lgr indicating the center of the reflected light Lr entering the light receiving sensor 23 is defined as the Z-axis direction, and the X-axis direction (vertical direction) and the Y-axis direction (horizontal direction) are set along a plane orthogonal to the Z-axis direction. In the present embodiment, the optical axis Lgm of the marker light Lm is parallel to the optical axis Lgr and along the Z-axis direction.
As shown in fig. 2, in order to reduce the deviation between the center of the imaging range and the center of the marker light, the marker light irradiator 22 is arranged to make the optical axis Lgm of the marker light Lm parallel to the optical axis Lgr which is the center of the imaging range of the light receiving sensor 23, and to reduce the distance X between the optical axis Lgm and the optical axis Lgr as small as possible in design. In the present embodiment, the optical axis Lgm of the marker light Lm and the optical axis Lgr, which is the center of the imaging range, are configured to be substantially parallel to the substrate surface of the substrate 20 a.
Therefore, in the present embodiment, the marker light irradiation section 22 is disposed so as to bring the marker light Lm closer to the upper edge 24U of the mirror 24 (the edge portion farthest from the imaging lens 25 among the outer edges of the mirror 24) (i.e., to bring the marker light Lm as close as possible to the upper edge 24U). Further, in order not to bring the marker light irradiation section 22 into the imaging range of the light receiving sensor 23, the marker light irradiation section 22 is mounted on a substrate 20b different from the substrate 20a so that the marker light irradiation section 22 is located farther than the mirror 24 with respect to the reading port 13 in the Z-axis direction and the X-axis direction.
That is, the marker light irradiator 22 is provided at a position farther than the reflecting mirror 24 in the Z-axis direction and the X-axis direction with respect to the reading port 13, and is disposed so that the optical axis Lgm of the marker light Lm is parallel to the optical axis Lgr which is the center of the imaging range of the light receiving sensor 23, and the marker light Lm is brought close to the upper edge 24U (outer edge) of the reflecting mirror 24. For example, although the distance Ls between the lower end of the beam-shaped marker light Lm and the upper edge 24U of the reflecting mirror 24 may theoretically be Ls equal to 0, in actual design, the minute predetermined value Δ Lmin < Ls < the maximum value Δ Lmax which can be regarded as "approaching" as described above. That is, the meaning of "close (proximity)" means "Δ Lmin ≦ Ls < Δ Lmax".
With this configuration, since it is not necessary to mount the marker light irradiation unit 22 and the light receiving sensor 23 on the same substrate, it is possible to eliminate the influence of the size of the light receiving sensor 23 and the marker light irradiation unit 22, the area required for mounting, and the like on the distance X between the optical axis Lgm of the marker light Lm and the optical axis Lgr that is the center of the imaging range. That is, since the marker light Lm passes near the upper edge of the mirror 24, the distance X between the optical axis Lgm of the marker light Lm and the optical axis Lgr, which is the center of the imaging range, is determined by the size of the mirror 24, and therefore, the deviation between the center of the marker light and the center of the imaging range can be reduced without hindering the miniaturization of the optical information reading apparatus 10.
The marker light irradiation unit 22 is not limited to being disposed so that the marker light Lm is close to (close to) the upper edge 24U of the reflector 24, and may be disposed so that the marker light Lm is close to (close to) a part of the outer edge of the reflector 24 other than the upper edge, such as the left edge 24L or the right edge 24R. Even with such an arrangement, since the distance X between the optical axis Lgm of the marker light Lm and the optical axis Lgr that is the center of the imaging range is determined by the size of the mirror 24 by passing the marker light Lm through the vicinity of the outer edge of the mirror 24, the deviation between the center of the marker light and the center of the imaging range can be reduced without hindering the miniaturization of the optical information reading apparatus 10.
[ second embodiment ]
Next, an optical information reading apparatus according to a second embodiment of the present invention will be described with reference to fig. 3.
As shown in fig. 3, the second embodiment is mainly different from the optical information reading apparatus of the first embodiment in that the marker light irradiation section 22 is disposed so that the marker light Lm is close to (approaches) the lower edge 24D of the mirror 24 (the edge portion of the outer edge closer to the imaging lens 25).
Accordingly, the marker light Lm is irradiated closer to the substrate surface of the substrate 20a on which the light receiving sensor 23 is mounted than the optical axis Lgr which is the center of the imaging range, and therefore the height of the optical system in the direction perpendicular to the substrate surface can be reduced, and further miniaturization of the optical information reading apparatus 10 can be achieved.
[ third embodiment ]
Next, an optical information reading apparatus according to a third embodiment of the present invention will be described with reference to fig. 4.
As shown in fig. 4, the third embodiment is mainly different from the optical information reading device of the first embodiment in that the entire surface of the reflection surface 24b of the reflection mirror 24a is formed to substantially coincide with the imaging range of the light receiving sensor 23.
In this way, when the entire surface of the reflecting surface 24b of the reflecting mirror 24a is formed to substantially coincide with the imaging range of the light receiving sensor 23, the size of the reflecting mirror 24a can be reduced without changing the imaging range of the light receiving sensor 23, and therefore, the distance X between the optical axis Lgm and the optical axis Lgr becomes smaller than that of the first embodiment, and the deviation between the center of the marker light Lm and the center of the imaging range can be further reduced.
In particular, in the present embodiment, the reflecting mirror 24a is disposed closer to the imaging lens 25 than in the first embodiment described above. Thus, by forming the entire surface of the reflection surface 24b of the mirror 24a to substantially coincide with the imaging range of the light receiving sensor 23, the size of the mirror 24 can be further reduced, and the distance X between the optical axis Lgm and the optical axis Lgr can be further reduced.
In other embodiments, the characteristic configuration of the present embodiment, that is, the entire surface of the reflection surface 24b of the mirror 24a and the imaging range of the light receiving sensor 23 can be made substantially equal.
[ fourth embodiment ]
Next, an optical information reading apparatus according to a fourth embodiment of the present invention will be described with reference to fig. 5.
The fourth embodiment is mainly different from the optical information reading apparatus of the first embodiment in that the marker light irradiating section 22 and the light receiving sensor 23 are mounted on the same substrate 20a, and a marker light reflecting mirror 26 is additionally provided.
As shown in fig. 5, the marker light irradiation section 22 is mounted on the substrate 20a in the following manner: the marker light Lm is irradiated in a direction perpendicular to the substrate surface of the substrate 20 a. Further, the marker light reflecting mirror 26 is configured to reflect the marker light Lm irradiated from the marker light irradiating section 22 as follows: the optical axis Lgm is parallel to the optical axis Lgr, which is the center of the imaging range of the light receiving sensor 23, and is close to the upper edge of the mirror 24.
Thus, even if the marker light irradiation unit 22 and the light receiving sensor 23 are mounted on the same substrate 20a, the distance X between the optical axis Lgm of the marker light Lm and the optical axis Lgr that is the center of the imaging range is determined by the size of the mirror 24, and therefore, it is possible to reduce the deviation between the center of the marker light and the center of the imaging range and to further reduce the size of the optical information reading device 10.
The marker light reflecting mirror 26 is not limited to being disposed so that the marker light Lm is close to the upper edge 24U of the reflecting mirror 24, and may be disposed so that the marker light Lm is close to a part of the outer edge of the reflecting mirror 24 other than the upper edge 24U, such as the left edge 24L or the right edge 24R. Even with such an arrangement, since the distance X between the optical axis Lgm of the marker light Lm and the optical axis Lgr that is the center of the imaging range is determined by the size of the mirror 24 by passing the marker light Lm through the vicinity of the outer edge of the mirror 24, it is possible to reduce the deviation between the center of the marker light and the center of the imaging range and to further miniaturize the optical information reading device 10.
In particular, as shown in fig. 6, the marker light reflecting mirror 26 may be disposed so that the marker light Lm approaches (approaches) the lower edge 24D of the reflecting mirror 24 (the edge portion of the outer edge closer to the imaging lens 25). In this case, since the marker light Lm is irradiated so as to be closer to the substrate surface of the substrate 20a on which the light receiving sensor 23 is mounted than the optical axis Lgr which is the center of the imaging range, the height of the optical system in the direction orthogonal to the substrate surface can be reduced, and further miniaturization of the optical information reading apparatus 10 can be achieved.
[ fifth embodiment ]
Next, an optical information reading apparatus according to a fifth embodiment of the present invention will be described with reference to fig. 7 and 8.
The fifth embodiment is mainly different from the optical information reading apparatus of the first embodiment in that the reflecting mirror 24 is removed, and a reflecting mirror 51 for marker light is additionally provided as a reflecting element for reflecting the marker light Lm to the imaging range of the light receiving sensor 23.
In the present embodiment, as shown in fig. 7 and 8, the light receiving sensor 23 is mounted on the substrate 20c for the reader module, and is disposed so that the optical axis Lgr, which is the center of the imaging range, is substantially perpendicular to the substrate surface of the substrate 20 c. The substrate 20C is integrated in the reading module 50, and is configured such that the reflected light Lr from the information code C incident from the outside via the reading port 13 is received by the light receiving sensor 23.
In the present embodiment, the marker light irradiation section 22 is configured as an element of the reading module 50. The marker light irradiation section 22 is located near the imaging lens 25 and is configured to irradiate the marker light Lm toward the emission side of the imaging lens 25 without intersecting the optical axis Lgr with the marker light Lm.
The marker light reflecting mirror 51 is arranged outside the imaging range of the light receiving sensor 23 and close to the imaging lens 25 as follows: the optical axis Lgm of the reflected marker light Lm is made parallel to and close to the optical axis Lgr which is the center of the imaging range. More specifically, the mirror 51 for marker light is configured such that the optical axis Lgm coincides with the optical axis Lgr in the Y-axis direction as shown in fig. 7, and the optical axis Lgm reflects the marker light Lm at a distance Δ X from the optical axis Lgr in the X-axis direction as shown in fig. 8. In the vicinity of the imaging lens 25, since the imaging range of the light receiving sensor 23 is narrow, the marker light reflecting mirror 51 is easily brought close to the optical axis Lgr without being imaged by the light receiving sensor 23, and the distance Δ X between the optical axis Lgm and the optical axis Lgr becomes small.
As described above, in the present embodiment, the marker light reflecting mirror 51 is provided as a reflecting element that reflects the marker light Lm irradiated from the marker light irradiating section 22 toward the imaging range of the light receiving sensor 23, and the marker light reflecting mirror 51 is disposed outside the imaging range of the light receiving sensor 23 and close to the imaging lens 25 as follows: the optical axis Lgm of the reflected marker light Lm is made parallel to and close to the optical axis Lgr which is the center of the imaging range of the light receiving sensor 23.
This eliminates the influence of the size of the light receiving sensor 23 and the marker light irradiating section 22, the area required for mounting, and the like on the distance Δ X between the optical axis Lgm of the marker light Lm and the optical axis Lgr that is the center of the imaging range. That is, since the imaging range is narrow near the imaging lens 25, the marker light reflecting mirror 51 is easily brought close to the optical axis Lgr which is the center of the imaging range without entering the imaging range, and therefore, the deviation between the center of the marker light and the center of the imaging range can be reduced without hindering the miniaturization of the optical information reading device 10.
[ sixth embodiment ]
Next, an optical information reading apparatus according to a sixth embodiment of the present invention will be described with reference to fig. 9 to 13.
The sixth embodiment is mainly different from the optical information reading apparatus of the fifth embodiment in that a marker light irradiation section 61 and a marker light lens 64 are used instead of the marker light irradiation section 22 and the marker light reflecting mirror 51.
In the present embodiment, as shown in fig. 9 to 11, the marker light irradiation section 61 configured as one element of the reading module 60 is configured to include the marker light LED62 and the marker light iris 63, unlike the marker light irradiation section 22, without including a lens for condensing and collimating the marker light. Therefore, the light emitted from the marker light LED62 is diffused by the marker light diaphragm 63 and enters the marker light lens 64 as marker light Lm.
The marker light lens 64 is configured as a reflecting element, and has an incident surface 65, an emission surface 66, and a reflecting surface 67, and the reflecting surface 67 internally reflects the marker light Lm incident from the incident surface 65 to the emission surface 66 as follows: the optical axis Lgm of the marker light Lm incident from the incident surface 65 is made parallel to the optical axis Lgr which is the center of the imaging range. The marker light lens 64 is configured as a collimating lens, and condenses and collimates the marker light Lm according to the curvatures provided on the incident surface 65 and the emission surface 66.
The marker light lens 64 is arranged outside the imaging range of the light receiving sensor 23 and close to the imaging lens 25, similarly to the marker light reflecting mirror 51. More specifically, the lens 64 for marker light is arranged such that the optical axis Lgm coincides with the optical axis Lgr in the Y-axis direction shown in fig. 9, and the optical axis Lgm reflects the marker light Lm by a distance Δ X from the optical axis Lgr in the X-axis direction shown in fig. 10.
Here, the curvatures of the incident surface 65 and the emission surface 66 will be described.
The incident surface 65 is formed with a curvature such that the incident marker light Lm is condensed and totally reflected by the reflecting surface 67. The light emitting surface 66 is formed with a curvature larger than that of the light incident surface 65, and collimates the marker light Lm reflected by the reflecting surface 67 by condensing it.
In addition, compared to the lens 110B in which the incident surface 111B is a curved surface and the emission surface 112B is a flat surface as shown in fig. 12B, the lens 110a in which the incident surface 111a is a flat surface and the emission surface 112A is a curved surface as shown in fig. 12A has a longer distance from the position of the diaphragm 101 to the curved surface in the marker light irradiation part 100. That is, by forming the lens such that the curvature of the exit surface is larger than the curvature of the entrance surface, the position of the diaphragm 101 in the marker light irradiation section 100 is equivalent to a case where the lens 110 is located farther away than a case where the curvature of the exit surface is smaller than the curvature of the entrance surface.
Even if the marker light Lm is collimated and emitted, if the distance from the lens 110 to the reading target (see the symbol L in fig. 13) and the diameter of the diaphragm 101 in the marker light irradiation unit 100 (see the symbol D in fig. 13) are constant, as can be seen from the contents disclosed in fig. 13A and 13B and the following equation (1), the longer the distance B from the position of the diaphragm 101 to the lens 110 (see the symbols B1 and B2 in fig. 13), the smaller the spot diameter D (see the symbols D1 and D2 in fig. 13) when the marker light Lm is irradiated to the reading target.
D＝d×L/B……(1)
Thus, when the spot diameter D of the marker light Lm becomes small, the marker light Lm becomes bright. Therefore, as shown in fig. 11, the spot diameter D is reduced by making the curvature of the emission surface 66 larger than the curvature of the incident surface 65, and the marker light Lm can be brightened.
As described above, in the present embodiment, the marker light lens 64 functioning as a reflecting element is configured as a collimating lens having the incident surface 65, the emission surface 66, and the reflecting surface 67, and collimates the marker light Lm by condensing the marker light Lm according to the curvature provided on the incident surface 65 and the emission surface 66, wherein the reflecting surface 67 internally reflects the marker light Lm incident from the incident surface 65 to the emission surface 66 as follows: the optical axis of the marker light Lm incident from the incident surface 65 is made parallel to the optical axis Lgr which is the center of the imaging range.
Thus, the marker light lens 64 has both a function as a collimating lens and a function as a reflecting lens with respect to the marker light Lm, and therefore the marker light irradiating section 61 does not need a collimating lens, the number of components is reduced, and the optical information reading apparatus 10 can be downsized.
In particular, since the marker light lens 64 is formed such that the curvature of the emission surface 66 is larger than the curvature of the incident surface 65, the distance from the position of the diaphragm to the lens becomes substantially longer, the spot diameter becomes smaller, and the marker light Lm can be brightened, so that the visibility of the marker light Lm can be improved.
Further, the marker light lens 64 may be configured as a lens (reflecting element) as follows, depending on the required visibility of the marker light, and the like: the marker light Lm is condensed and collimated by the curvature of at least one of the incident surface 65 and the emission surface 66. For example, the marker light lens 64 may be formed such that the incident surface is a flat surface and the exit surface is a curved surface as illustrated in fig. 12A, or may be formed such that the incident surface is a curved surface and the exit surface is a flat surface as illustrated in fig. 12B, depending on the visibility of the marker light required and the like.
[ seventh embodiment ]
Next, an optical information reading apparatus according to a seventh embodiment of the present invention will be described with reference to fig. 14 to 16.
The seventh embodiment is mainly different from the optical information reading apparatus of the sixth embodiment in that the marker light is irradiated with the predetermined pattern so as to show the outer edge of the imaging range of the light receiving sensor 23, and the marker light irradiating section 71 and the marker light lens 72 are used instead of the marker light lens 61 and the marker light lens 64 in order to reduce the deviation between the center of the marker light irradiated with the predetermined pattern and the center of the imaging range.
In the present embodiment, as shown in fig. 14 and 15, the marker light irradiation section 71, which is a component of the reading module 70, is configured by a laser diode or the like that irradiates laser light as marker light Lm.
As shown in fig. 16, the marker light lens 72 is configured as a reflecting element, and includes an incident surface 73, an emission surface 74, and a reflecting surface 75, and the reflecting surface 75 internally reflects the marker light Lm incident from the incident surface 73 to the emission surface 74 as follows: the optical axis Lgm of the marker light Lm incident from the incident surface 73 is made parallel to the optical axis Lgr which is the center of the imaging range. In the marker light lens 72, the marker light Lm is incident as laser light from the marker light irradiation unit 71, and therefore, a curved surface for condensing light is not required on the incident surface 73 and the emission surface 74.
In particular, in the marker light lens 72, a diffractive optical element (diffraction grating) 76 is integrally provided on the emission surface 74. The diffractive optical element 76 is, for example, a computer-generated hologram CGH or the like, and is configured to split light incident from the reflection surface 75 into marker light Lm1 in a cross shape indicating the optical axis Lgm thereof and four marker lights Lm2 symmetrical to the optical axis Lgm as a predetermined pattern. In particular, the diffractive optical element 76 is configured such that four marker lights Lm2 show the four corners of the imaging range of the light receiving sensor 23.
The marker light lens 72 configured in this manner is arranged outside the imaging range of the light receiving sensor 23 and close to the imaging lens 25, similarly to the marker light reflecting mirror 51 and the marker light lens 64 described above. More specifically, the lens 72 for marker light is arranged such that the optical axis Lgm coincides with the optical axis Lgr in the Y-axis direction shown in fig. 14, and the optical axis Lgm reflects the marker light Lm by a distance Δ X from the optical axis Lgr in the X-axis direction shown in fig. 15.
As described above, in the present embodiment, the diffractive optical element 76 is provided on the emission surface 74 of the marker light lens 72 having the reflection surface 75 that internally reflects the marker light, and the diffractive optical element 76 diffracts the marker light internally reflected by the reflection surface 75 so as to form a predetermined pattern. Thus, even when the marker lights Lm1 and Lm2 formed as the predetermined pattern are irradiated so as to show the outer edge of the imaging range, the deviation between the center of the predetermined pattern that functions as the marker light and the center of the imaging range can be reduced.
The diffractive optical element 76 provided on the light exit surface 74 is not limited to being configured to split the light incident from the reflection surface 75 into the marker light Lm1 and the four marker lights Lm2 as a predetermined pattern, and may be configured to irradiate other patterns so as to make the imaging range visible. The diffractive optical element 76 is not limited to being integrally molded with the emission surface 74 as described above, and may be formed separately and integrated with the emission surface 74 from the rear.
[ other embodiments ]
The present invention is not limited to the above embodiments, and may be embodied as follows, for example.
(1) In the above embodiments, the mirrors 24 and 24a and the marker light irradiation unit 22 are arranged such that the optical axis Lgm of the marker light Lm and the optical axis Lgr, which is the center of the imaging range, are substantially parallel to the substrate surface of the substrate 20a, but the present invention is not limited to this, and the optical axis Lgm and the optical axis Lgr may be arranged so as to be inclined with respect to the substrate surface of the substrate 20 a.
(2) The present invention can be applied to an information reading apparatus having a function of optically reading an information code and also having other functions, for example, a wireless communication function of performing wireless communication with a wireless communication medium.
Claims (9)
1. An optical information reading apparatus, comprising:
a light receiving sensor capable of imaging an information code;
a reflecting mirror that reflects the reflected light from the information code via a reading port to the light receiving sensor;
an imaging lens for condensing the light reflected by the mirror and imaging the light on the light receiving sensor; and
a marker light irradiation unit that irradiates marker light indicating a center of an imaging range of the light receiving sensor;
the marker light irradiation section is provided at a position farther than the reflecting mirror with respect to the reading port, and is arranged so that the optical axis of the marker light is parallel to the optical axis that is the center of the imaging range of the light receiving sensor, and the marker light passes through the outer side of the outer edge of the reflecting mirror at a predetermined distance from the outer edge of the reflecting mirror, whereby the distance between the optical axis of the marker light and the optical axis that is the center of the imaging range is determined by the size of the reflecting mirror.
2. Optical information reading apparatus according to claim 1,
the marker light irradiation section is configured to pass the marker light outside the outer edge of the mirror by the predetermined distance from an edge portion of the outer edge of the mirror that is close to the imaging lens.
3. Optical information reading apparatus according to claim 1 or 2,
the reflecting mirror is formed so that the entire reflecting surface coincides with the imaging range of the light receiving sensor.
4. Optical information reading apparatus according to claim 1 or 2,
the marker light irradiating section is mounted on the same substrate as the light receiving sensor,
a marker light reflecting mirror that reflects the marker light irradiated from the marker light irradiating section in such a manner that: the distance between the optical axis of the marker light and the optical axis that is the center of the imaging range is determined by the size of the mirror by making the optical axis of the marker light parallel to the optical axis that is the center of the imaging range of the light receiving sensor and passing outside the outer edge of the mirror at the predetermined distance from the outer edge of the mirror.
5. Optical information reading apparatus according to claim 3,
the marker light irradiating section is mounted on the same substrate as the light receiving sensor,
a marker light reflecting mirror that reflects the marker light irradiated from the marker light irradiating section in such a manner that: the distance between the optical axis of the marker light and the optical axis that is the center of the imaging range is determined by the size of the mirror by making the optical axis of the marker light parallel to the optical axis that is the center of the imaging range of the light receiving sensor and passing outside the outer edge of the mirror at the predetermined distance from the outer edge of the mirror.
6. An optical information reading apparatus, comprising:
a light receiving sensor capable of imaging an information code;
an imaging lens for condensing the reflected light from the information code and imaging the light on the light receiving sensor;
a marker light irradiation unit that irradiates marker light indicating a center of an imaging range of the light receiving sensor; and
a reflecting element that reflects the marker light irradiated from the marker light irradiating section toward an imaging range of the light receiving sensor;
the reflecting element is disposed outside the imaging range of the light receiving sensor and at a position closer to the reading port than the imaging lens as follows: the optical axis of the reflected marker light is made parallel to the optical axis that is the center of the imaging range of the light receiving sensor, and coincides with the optical axis that is the center of the imaging range in a first direction that is a direction orthogonal to the direction of the optical axis that is the center of the imaging range, and is a predetermined distance from the optical axis that is the center of the imaging range in a second direction that is a direction orthogonal to the direction of the optical axis that is the center of the imaging range and the first direction.
7. Optical information reading apparatus according to claim 6,
the reflecting element is configured as a collimating lens having an incident surface, an exit surface, and a reflecting surface, and collimating the marker light by condensing the marker light according to a curvature provided on at least one of the incident surface and the exit surface, wherein the reflecting surface internally reflects the marker light incident from the incident surface to the exit surface as follows: an optical axis of the marker light incident from the incident surface is made parallel to an optical axis that is a center of the imaging range.
8. An optical information reading apparatus according to claim 7,
the reflecting element is formed such that the curvature of the exit surface is larger than the curvature of the entrance surface.
9. Optical information reading apparatus according to claim 6,
the reflecting element is configured as a lens having an incident surface, an exit surface, and a reflecting surface that internally reflects the marker light incident from the incident surface to the exit surface as follows: an optical axis of the marker light incident from the incident surface is made parallel to an optical axis which is a center of the imaging range,
a diffractive optical element that diffracts the marker light reflected inside the reflection surface to form a predetermined pattern is provided on the emission surface.
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| JP2015-175442 | 2015-09-07 | ||
| JP2015175442 | 2015-09-07 | ||
| JP2016-144238 | 2016-07-22 | ||
| JP2016144238A JP6811559B2 (en) | 2015-09-07 | 2016-07-22 | Optical information reader |
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| CN109858297B (en) * | 2017-10-26 | 2022-09-23 | 电装波动株式会社 | Information reading apparatus |
| CN109815766B (en) * | 2019-01-25 | 2022-05-03 | 深圳市优博讯科技股份有限公司 | Bar code scanning method and device, mobile terminal and readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423645A3 (en) * | 1989-10-16 | 1992-08-12 | Symbol Technologies, Inc. | Portable laser diode scanning head |
| CN1080073A (en) * | 1992-12-23 | 1993-12-29 | 欧林巴斯光学工业股份有限公司 | Band sweep limit and the self-adjusting laser scanning device of spot definition |
| CN101364256A (en) * | 2007-08-06 | 2009-02-11 | 电装波动株式会社 | Information reader for optically reading code |
| CN104756133A (en) * | 2012-10-25 | 2015-07-01 | 讯宝科技公司 | Compact imaging module with adjustable aiming pattern and arrangement for and method of spatially adjusting the aiming pattern |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3562395B2 (en) * | 1999-08-25 | 2004-09-08 | 株式会社デンソー | Optical information reader |
| KR20040079555A (en) * | 2003-03-07 | 2004-09-16 | 삼성전자주식회사 | Optical head and optical path adjusting method of the same |
| JP4215028B2 (en) * | 2005-05-25 | 2009-01-28 | 株式会社デンソーウェーブ | Optical information reader |
| TW200943287A (en) * | 2008-04-03 | 2009-10-16 | Univ Nat Chiao Tung | A micro type optical reading device |
| JP2013061587A (en) * | 2011-09-15 | 2013-04-04 | Alps Electric Co Ltd | Beam splitter and optical communication module using the same |
| US8978982B2 (en) * | 2012-06-19 | 2015-03-17 | Symbol Technologies, Inc. | Aiming system for imaging scanner |
| TWI595424B (en) * | 2013-10-09 | 2017-08-11 | Ｏｐｔｏ電子有限公司 | Optical information reader and illuminating method |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423645A3 (en) * | 1989-10-16 | 1992-08-12 | Symbol Technologies, Inc. | Portable laser diode scanning head |
| CN1080073A (en) * | 1992-12-23 | 1993-12-29 | 欧林巴斯光学工业股份有限公司 | Band sweep limit and the self-adjusting laser scanning device of spot definition |
| CN101364256A (en) * | 2007-08-06 | 2009-02-11 | 电装波动株式会社 | Information reader for optically reading code |
| CN104756133A (en) * | 2012-10-25 | 2015-07-01 | 讯宝科技公司 | Compact imaging module with adjustable aiming pattern and arrangement for and method of spatially adjusting the aiming pattern |
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| TWI625677B (en) | 2018-06-01 |
| JP2017054492A (en) | 2017-03-16 |
| TW201723923A (en) | 2017-07-01 |
| JP6811559B2 (en) | 2021-01-13 |
| CN107016308A (en) | 2017-08-04 |
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