JP4565161B2 - A light guide and a medium gate mechanism including the light guide. - Google Patents

Description

  The present invention relates to a light guide that emits light by light from a light source such as an LED, and a medium gate mechanism including the light guide.

  Conventionally, there are cases where the vicinity of a card insertion opening (gate opening) of a card reader is illuminated so that a user can visually recognize the position of the card insertion opening even in a dark place, or a decoration function is exhibited in a dark place. For example, in the card gate mechanism in the card reader disclosed in Patent Document 1, a plurality of LEDs are used as light emission sources, and the gate frame constituting the card insertion slot is illuminated.

  However, in order to reduce the number of parts and the manufacturing cost, it is necessary to illuminate the gate frame with as few (for example, one) LEDs. Therefore, for example, it is considered that the gate frame of the card gate mechanism is lit using the surface emitting display device disclosed in Patent Document 2. The surface-emitting display device disclosed in Patent Document 2 uses one LED as a light source, and when light emitted from the LED enters the light guide plate, scattering and reflection are repeated in the wedge-shaped light guide plate. In this process, light is emitted from the emission surface, and an arbitrary picture or character is displayed using the emitted light. According to this surface light emitting display device, the entire side of the gate frame can be illuminated by one LED.

Tokushui WO02 / 042990 (see Fig. 2) JP 2001-229723 A (see FIG. 1)

  However, the surface-emitting display device disclosed in Patent Document 2 has a problem that one side of the gate frame cannot be illuminated uniformly.

  That is, in the surface light emitting display device disclosed in Patent Document 2, scattering and reflection are repeated in the wedge-shaped light guide plate as described above, and light is emitted from the emission surface in the process. Of these, light emitted in a direction substantially perpendicular to the emission surface is generated from light that has hardly undergone reflection at the emission surface or reflection surface in the vicinity of the LED, while at an area away from the LED, the emission surface. Or it produces | generates from the light after passing through the reflection in a reflective surface several times.

  Therefore, the light emitted in the direction substantially perpendicular to the emission surface has a large amount of light (intensity of light) in the vicinity of the LED and a small amount of light (intensity of light) in the portion away from the LED. In particular, the amount of light varies between the vicinity of the LED and the portion away from the LED, and the gate frame cannot be illuminated uniformly.

  The present invention has been made in view of such points, and an object thereof is a light guide capable of suppressing variations in the amount of light emitted in a direction substantially perpendicular to the emission surface, and the light guide. It is to provide a medium gate mechanism with a body.

  In order to solve the above problems, the present invention provides the following.

(1) In the light guide having an incident surface on which light is incident, an exit surface that emits the incident light, and a reflective surface that faces the exit surface and reflects the incident light, the reflection The surface includes a plurality of first reflecting portions that reflect light in a direction substantially perpendicular to the emission surface, and a plurality of second reflecting portions formed between each of the plurality of first reflecting portions, The first reflecting portion is formed to be a paraboloid having a Fresnel shape, and the focal point of the paraboloid is on an intersection formed when each of the plurality of second reflecting portions is extended. A light guide body that is located and has a plurality of lenses that are provided on the exit surface and have a focus at substantially the center of the first reflecting portion .

  According to the present invention, in the light guide having the entrance surface, the exit surface, and the reflective surface, the reflective surface includes a plurality of first reflective portions that reflect light in a direction substantially perpendicular to the exit surface, and a plurality of first reflectors. A plurality of second reflecting portions formed between each of the reflecting portions, and the first reflecting portion is formed to be a paraboloid having a Fresnel shape, and the focal point of the paraboloid is Since it is located on the intersecting line formed when each of the plurality of second reflecting portions is extended, variation in the amount of light emitted in a direction substantially perpendicular to the emission surface can be suppressed.

  That is, the first reflecting portion of the reflecting surface is a paraboloid focusing on a point located on the intersection formed when each of the plurality of second reflecting portions is extended, and from the Fresnel shape In other words, the light emitted from the focal point is reflected in a direction substantially perpendicular to the exit surface at any first reflecting portion. Accordingly, for example, by making a light emitting point based on a light source such as an LED coincide with the above-described focal point, any first reflecting portion of the plurality of first reflecting portions is emitted in a direction substantially perpendicular to the emission surface. As a result of the uniform generation of light, it is possible to suppress variations in the amount of light emitted in the direction substantially perpendicular to the exit surface between the vicinity of the light emitting point and the location away from the light emitting point.

  In particular, in the present invention, the first reflecting part is not simply formed so as to be a parabolic surface having a Fresnel shape, but the focal point of the parabolic surface described above extends each of the plurality of second reflecting parts. It is set as the structure located on the intersection line formed. Therefore, since the area | region where the light emitted from the focus does not hit can be excluded among the 1st reflection parts, the light inject | emitted in the direction substantially perpendicular | vertical to an emission surface can be obtained efficiently.

  Here, “a paraboloid made of Fresnel shape” means that the thickness of the paraboloid (thickness in the direction connecting the apex of the paraboloid and the focal point) is reduced while maintaining the condensing performance of the paraboloid. Say. In addition, the focal point of the paraboloid is positioned “on the intersection line formed when each of the second reflection parts is extended”, but on the intersection line formed when all the second reflection parts are extended. It may be on an intersecting line formed when a part of (a plurality of) second reflecting portions are extended. Furthermore, the focal point of the paraboloid is assumed to be “on the line of intersection”, but this may be that the focal point is completely coincident with any point on the line of intersection, or the point of focus is any point near the line of intersection. May match.

The front Symbol exit surface, characterized in that a lens to focus the substantially center of the first reflecting portion is provided with a plurality.

  According to the present invention, since the above-described exit surface is provided with a plurality of lenses (for example, provided with a lens array) having a focal point at substantially the center of the first reflecting portion, light on the exit surface is provided. It is possible to enlarge the unevenness of the light and make the light emitted from the exit surface more uniform.

  That is, when the exit surface is visually recognized through a plurality of lenses, the light-free region can be narrowed compared to the case where the exit surface is viewed without passing through the plurality of lenses. Can be made more uniform (a variation in the amount of light can be suppressed).

  Here, in the present invention, a plurality of lenses having a focal point at the approximate center of the first reflecting portion are “provided”. However, for example, a plurality of lenses may be retrofitted to the exit surface, or the exit surface And a plurality of lenses may be integrally formed. Further, the “plurality of lenses” may be a so-called lens array formed integrally or a plurality of independent lenses.

(2) The light guide according to (1 ), wherein the second reflecting portion is a flat surface.
(3) The light guide body according to (1) or (2), wherein a reflection member that prevents light transmission is provided on the reflection surface.

  According to the present invention, the reflective surface described above is provided with a reflective member that prevents light transmission (for example, a mirror coat is applied), so that emission of light from the reflective surface is prevented, and as a result, light flux loss. Can be prevented.

(4) The light guide according to (3), wherein the reflecting member is provided on a surface in the vicinity of the focal point of the paraboloid , among the surfaces orthogonal to the reflecting surface.

  According to the present invention, since the reflecting member is provided on the surface in the vicinity of the focal point among the surfaces orthogonal to the above-described reflecting surface, emission of light from this surface is prevented, thereby preventing loss of light flux. Can do. In particular, according to the present invention, since the reflecting member is provided only on the surface near the focal point where the incident angle of light is small, it is possible to efficiently prevent the light from being emitted from the surface near the focal point which is most easily transmitted, and to be reflected by the reflecting member. It is possible to suppress the attenuation of light that occurs due to this.

(5) Of the light guide formed in an elongated shape along the emission surface, a chamfer at a predetermined angle is applied to a tip opposite to the focal point of the paraboloid. The light guide according to any one of (1) to (4).

  According to the present invention, a chamfer of a predetermined angle (for example, 45 degrees) is applied to the tip of the light guide formed in an elongated shape along the exit surface described above on the side opposite to the focal point. Therefore, the light that has passed through the light guide can be guided in a direction orthogonal to the longitudinal direction of the light guide.

  (6) The light guide according to (5), wherein a protrusion protruding in a direction substantially orthogonal to the reflection surface is provided at the tip.

  According to the present invention, since the protruding portion protruding in the direction substantially orthogonal to the reflecting surface is provided at the above-described tip, the light guided in the direction orthogonal to the longitudinal direction of the light guide is It can be made to inject from one side of a projection part. Thereby, for example, the exit surface for emitting the incident light can be formed in an L shape instead of a line shape. For example, by combining two light guides having protrusions, the exit surface for emitting the incident light can be formed in a square shape.

  (7) In a medium gate mechanism in a medium processing apparatus having a gate port into which a medium is inserted and a medium transport mechanism that transports the medium inserted from the gate port to the inside, the medium gate mechanism includes the gate port And a light guide according to claim 1 for guiding light from a light source to the gate frame.

  According to the present invention, in the medium gate mechanism in a medium processing apparatus (for example, a card reader) having a gate port and a medium transport mechanism, the light guide described above is used to guide light from the light source to the gate frame constituting the gate port. Therefore, it is possible to provide a medium gate mechanism in which variation in the amount of light incident on the gate frame is suppressed, and to provide a medium gate mechanism that can uniformly illuminate the gate frame. it can.

  (8) The medium gate mechanism according to (7), wherein the light guide and the gate frame are integrally formed.

  According to the present invention, since the light guide and the gate frame described above are integrally formed, a gate frame that can be uniformly illuminated can be easily incorporated into the medium gate mechanism. It also contributes to the efficiency of the manufacturing process.

  (9) The medium gate mechanism according to (7) or (8), wherein the gate frame is made of a transparent body, and a matte treatment is performed on a surface thereof.

  According to the present invention, the gate frame described above is made of a transparent body, and the surface is subjected to a mat (diffusion) treatment, so that the amount of light incident on the gate frame is small. Can even look brighter.

  More specifically, since the light guide described above obtains light emitted in a direction substantially perpendicular to the emission surface from the first reflecting portion, even if the lens array described above is provided, the light is emitted. It is unavoidable to become patchy. Therefore, for example, it is conceivable that the gate frame is made of a diffusing material and the light intensity of the entire gate frame is made uniform. However, in the case where the gate frame is formed of a diffusing material, the light incident on the gate frame is weakened due to transient diffusion, and as a result, the light intensity of the entire gate frame is reduced. On the other hand, if the gate frame is made of a transparent body and the surface is matted as in the present invention, the diffusion of transients is prevented and the light intensity of the entire gate frame is reduced. While preventing, the light intensity of the whole gate frame can be made uniform on the mat-treated surface. In this way, even if the amount of light incident on the gate frame is small, it can appear bright.

  As described above, according to the present invention, the first reflecting portion is a paraboloid having a Fresnel shape and is located on the intersection line formed when each of the plurality of second reflecting portions is extended. Since the light emitting point based on a light source such as an LED is made to coincide with the above-mentioned focal point, the emission surface is near the light emitting point and away from the light emitting point. Variation in the amount of light emitted in a direction substantially perpendicular to the direction can be suppressed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an external configuration of a light guide 1 according to an embodiment of the present invention.

  In FIG. 1, the light guide 1 is made of, for example, a light-transmitting thermoplastic resin such as an acrylic resin or a polycarbonate resin, is formed in an elongated shape along the exit surface, and has a rectangular cross section. The light guide 1 is formed with an incident surface 3 on which light is incident, an exit surface 6 that emits the incident light, and a reflective surface 5 that faces the exit surface and reflects the incident light. Has been.

  A light source 2 made of an LED is disposed in the vicinity of the incident surface 3, and light from the light source 2 enters the light guide 1 through the incident surface 3. The type of the light source 2 is not limited. A bullet-type or chip-type LED may be used, and any emission color LED such as white, blue, green, and red may be used.

  The light incident on the light guide 1 through the incident surface 3 is reflected by the inclined portion 4 and then propagates to the reflective surface 5 of the light guide 1. The reflecting surface 5 includes a plurality of first reflecting portions 5a that reflect light in a direction substantially perpendicular to the exit surface 6, and a plurality of second reflecting portions 5b that are formed between the plurality of first reflecting portions 5a. ,have. Further, the reflecting surface 5 and the inclined portion 4 are provided with a mirror coat (not shown) for preventing light transmission. Further, among the surfaces orthogonal to the reflecting surface 5, the surface near the light source 2 (both surfaces) is also mirror-coated (see the hatched portion in FIG. 1). These mirror coats can prevent light flux loss. In particular, the latter mirror coat effectively prevents light from being emitted from the surface through which light is most easily transmitted (see the hatched portion in FIG. 1), and reflects off the mirror coat at locations away from the light source 2. The attenuation of light caused by the above can be suppressed.

  In addition, as a kind of mirror coat, various kinds, such as a silver mirror coat, a gold mirror coat, a blue mirror coat, or a pink mirror coat, are mentioned. Further, instead of the mirror coat, for example, glass beads or prisms may be provided on the reflection surface 5, or a reflection sheet may be attached to the reflection surface 5. Furthermore, the reflective surface 5 may be a matte surface, or a white pigment may be applied to the reflective surface 5.

  A lens array 7 is integrally formed on the exit surface 6, and the lens array 7 has a structure in which a plurality of circular lenses having a focal point approximately at the center of the first reflecting portion 5 a are arranged. The light reflected by the reflecting surface 5 (mainly the first reflecting portion 5a) passes through the emitting surface 6 and the lens array 7 and is then emitted to the outside. On the other hand, a chamfered portion 8 of approximately 45 degrees is formed at the tip of the light guide 1 opposite to the side where the light source 2 exists. Further, a projection 9 protruding in a direction orthogonal to the reflecting surface 5 is formed at the tip.

  A state in which light is emitted in a direction substantially perpendicular to the emission surface in the light guide 1 having such a configuration will be described in detail with reference to FIG. 2 is a side view of the light guide 1 shown in FIG. 1 when viewed from the back side (X direction in FIG. 1).

In FIG. 2, the three lights L ₁ , L ₂ , and L ₃ emitted from the light source 2 are all reflected by the inclined portion 4, and then travel toward the first reflecting portion 5 a of the reflecting surface 5. These lights L _{1 to} L ₃ are all reflected by the first reflecting portion 5 a of the reflecting surface 5 so as to be light in a direction perpendicular to the emitting surface 6, and directly pass through the emitting surface 6 and the lens array 7. Through the outside.

  Here, in the first reflecting portion 5a of the reflecting surface 5, the reflected light becomes light in a direction substantially perpendicular to the exit surface 6 so that the first reflecting portion 5a is a paraboloid having a Fresnel shape. This is because the focal point of the paraboloid is located on the intersection line formed when the plurality of second reflecting portions 5b are extended. This principle will be described in detail with reference to FIG. FIG. 3 is an explanatory diagram for explaining the principle that the reflected light becomes light in a direction perpendicular to the exit surface 6 in the first reflecting portion 5 a of the reflecting surface 5.

In FIG. 3, a paraboloid 11 whose focal point is P in the figure is first considered (see FIG. 3A). When the light emitted from the focal point P is reflected by the paraboloid 11, the light is parallel to a straight line connecting the apex Q of the paraboloid 11 and the focal point P (for example, P _{1 to} P ₆ ).

  Next, attention is focused on the fan-shaped solid line portion of the paraboloid 11. FIG. 3B shows the fan-shaped solid line portion enlarged and formed so as to be a paraboloid having a Fresnel shape. In FIG. 3B, the thickness in the direction connecting the apex Q of the paraboloid 11 and the focal point P is smaller than that in FIG.

  Next, attention is paid to the arc 12 (thick line portion in FIG. 3). For example, when a light source such as an LED is disposed at the focal point P, the arc 12 is an area where no light hits and becomes a useless area. Therefore, FIG. 3C shows that the second reflecting portion 5b having a flat surface is formed by eliminating the useless arc 12. FIG. As shown in FIG. 3C, the focal point P is located on the intersection line formed when each of the plurality of second reflecting portions 5b is extended. The “intersection line” is a straight line in a direction perpendicular to the paper surface in FIG.

  As described above, according to FIGS. 2 and 3, the light source 2 such as an LED is aligned with the focal point, so that any one of the plurality of first reflection parts 5 a is perpendicular to the exit surface 6. Light emitted in any direction is generated uniformly. As a result, it is possible to suppress variations in the amount of light emitted in the direction perpendicular to the emission surface 6 in the vicinity of the light source 2 and in locations away from the light source 2.

  In FIG. 3, the light source 2 such as an LED is made to coincide with the focal point P. However, in FIG. 1, the light emitting point based on the light source 2 such as the LED is made coincident with the focal point P. This light emitting point will be specifically described with reference to FIG. FIG. 4 is a diagram showing a state when a light emitting point based on the light source 2 such as an LED is made coincident with the focal point P. FIG.

  As shown in FIG. 4, the emission point P ′ of the light source 2 and the focal point P are in a line-symmetric arrangement relationship with the inclined portion 4 as an axis. That is, when the light emitted from the emission point P ′ of the light source 2 is reflected by the inclined part 4 and the light path transmitted through the inclined part 4 when the emission point P ′ of the light source 2 is arranged at the focal point P, The optical path that passes through is the same optical path.

  Thus, according to FIG. 4, the focal point P and the emission point P ′ of the light source 2 are not matched, but the focal point P and the light emitting point based on the light source 2 are matched, so that the position of the light source 2 is reflected on the reflecting surface. The same effect can be obtained even if the light guide 5 is moved to the side 5, and as a result, a compact arrangement design of the light guide 1 and the light source 2 becomes possible. Here, the focal point P and the light emitting point based on the light source 2 are completely matched, but the light emitting point based on the light source 2 may be set near the focal point P (near the focal point P) without departing from the spirit of the present invention. Absent.

  FIG. 5 is a diagram illustrating an optical path inside the light guide 1 based on the action of the light guide 1 described with reference to FIGS. 3 and 4.

  As shown in FIG. 5, the plurality of lights emitted from the light source 2 are reflected by the inclined portions 4 functioning as mirrors, and at the same time, emitted from the first reflecting portion 5 a in a direction perpendicular to the emission surface 6. Light is generated. As a result, there is less variation in the amount of light emitted in the direction perpendicular to the exit surface 6 between the vicinity of the light source 2 (based on the light emitting point) and the location away from the light source 2 (based on the light emitting point).

  FIG. 6 is an explanatory diagram for explaining the operation of the lens array 7. In particular, FIGS. 6A and 6B show the optical path when the lens array 7 is not provided, and FIG. 6C shows the optical path when the lens array 7 is provided on the exit surface 6. Is shown.

In FIG. 6A, when the reflecting portion 5a is a paraboloid, the light L ₀₁ , the light L ₀₂ , L ₀₃ , and the light L ₀₄ reflected at a position slightly deviated from the center of the first reflecting portion 5a Like L ₀₀ , the light is emitted from a position slightly shifted in the direction perpendicular to the emission surface 6. Accordingly, when viewed from the exit surface 6, it appears as spots because it is divided into places where there are light rays to be emitted. Further, in FIG. 6 (b), the light L ₁₀ ~L ₁₄ emitted from the light source 2 is reflected on the inclined portion 4 and the first reflection portion 5a, when the reflection portion 5a is planar, each from the exit surface 6 Injected in the direction. Light L ₁₀ reflected at the center of the first reflecting portion 5a is emitted in the direction perpendicular to the exit surface 6, the light L ₁₁ is reflected by the slightly away from the center of the first reflecting portion 5a, the light L ₁₂ is The light L ₁₃ and the light L _{14 that} are emitted in a direction slightly inclined with respect to the direction perpendicular to the emission surface 6 and reflected at a position further deviated from the center of the first reflecting portion 5 a are in a direction perpendicular to the emission surface 6. On the other hand, it is ejected in the direction inclined further.

On the other hand, in FIG.6 (c), each lens which comprises the lens array 7 is a lens which makes a focus the approximate center of the 1st reflection part 5a which opposes. Here, if the reflecting surface 5a is regarded as the second light emitting point, the light L _{20 to} L ₂₄ transmitted through the lens array 7 provided on the exit surface 6 is different from the light L _{10 to} L ₁₄ described above, and the refraction of the lens. Due to the action, both become light in a direction perpendicular to the exit surface 6. Therefore, when the exit surface 6 of the light guide plate 1 is visually recognized, it can be seen that there are few places where there is no light beam to be emitted. (The width of the light beam emitted in the direction perpendicular to the emission surface 6 increases). As a result, compared with the case of FIG. 6A, the area without light can be narrowed, and as a result, the light emitted from the emission surface 6 can be made more uniform (variation in the amount of light can be suppressed). ).

  FIG. 7 is a diagram showing an optical path inside the light guide 1 based on the action of the lens array 7 described with reference to FIG.

  As shown in FIG. 7, the plurality of lights emitted from the light source 2 are reflected by the inclined portion 4, and at the same time, the light emitted in the first reflecting portion 5 a in a direction approximately perpendicular to the emission surface 6. Generated. On the other hand, a part of the light emitted from the light source 2 generates light that is emitted in a direction substantially perpendicular to the emission surface 6 at the inclined portion 9 a of the protrusion 9 described above. This will be described in detail with reference to FIG.

  FIG. 8 is a diagram illustrating an optical path of light emitted from the protrusion 9 of the light guide 1.

As shown in FIG. 8, a part of the light L ₄ emitted from the light source 2 is reflected by the inclined portion 4, then goes straight in the longitudinal direction in the light guide 1, and reaches the chamfered portion 8. To do. When the light is reflected by the chamfered portion 8, light in a direction orthogonal to the longitudinal direction of the light guide 1 (direction incident on the protruding portion 9) is generated. Thereafter, the light incident on the protrusion 9 is emitted in a direction approximately perpendicular to the emission surface 6 after being reflected by the inclined portion 9 a of the protrusion 9. Thereby, the exit surface 6 that emits the incident light can be formed in an L shape instead of a line shape.

  FIG. 9 is a schematic structural diagram showing the configuration of the card reader having the medium gate mechanism 100 according to the embodiment of the present invention. In particular, FIG. 9A is a plan view of the card reader, and FIG. 9B is an external view of the card reader when viewed from the front. In the present embodiment, the gate mechanism 100 of the card reader is considered as the medium gate mechanism. However, any mechanism having a gate port into which a medium such as a card or bill can be inserted, such as a gate mechanism of a banknote processing apparatus. It doesn't matter what.

  9A and 9B, the medium gate mechanism 100 is located near the front end of the substrate 102 on which the magnetic head 101 is mounted (the left front end in FIG. 9A), and the card is inserted. A gate port 103, a card transport mechanism 104 for transporting a card inserted from the gate port 103 to the inside, and a gate frame 105 constituting the gate port 103.

  Here, the medium gate mechanism 100 further includes a light guide 1 that guides light from a light source (for example, LED) 2 mounted on the substrate 102 to the gate frame 105 (FIG. 9A and FIG. 9). b) indicated by a chain line in the figure). Details of the light guide 1 are as described above. Then, as shown in FIG. 9B, two light guides 1 each having an L-shaped exit surface 6 are combined so that the upper, lower, left, and right (surroundings) of the elongated gate port 103 are illuminated. Yes.

  Further, the gate frame 105 is made of a transparent body, and a matte treatment is applied to the surface. Therefore, the light emitted from the exit surface 6 (the lens array 7 and the protrusion 9) of the light guide 1 is appropriately diffused on the surface of the gate frame 105 without being weakened by excessive diffusion in the gate frame 105, The light intensity of the entire gate frame is made uniform. A state when the gate frame 105 is illuminated is indicated by a hatched portion in FIG.

  As described above, by combining two light guides 1, the gate frame 105 can be efficiently illuminated with a small number of light sources, and the gate array 105 is mated by the action of the lens array 7 and the surface of the gate frame 105. Variations in the amount of light emitted from the frame 105 can be suppressed.

  In the present embodiment, the gate frame 105 and the light guide 1 are manufactured separately. However, the present invention is not limited to this, and for example, both can be integrally formed. This contributes to the efficiency of the manufacturing process.

  The light guide according to the present invention and the medium gate mechanism including the light guide are useful as those capable of suppressing variations in the amount of light emitted from the emission surface.

It is a perspective view which shows the external appearance structure of the light guide which concerns on embodiment of this invention. It is a side view when the light guide shown in FIG. 1 is seen from the back side (X direction in FIG. 1). It is explanatory drawing for demonstrating the principle from which the reflected light turns into the light of the direction substantially perpendicular | vertical to the output surface in the 1st reflection part of a reflective surface. It is a figure which shows a mode when the light emission point based on light sources, such as LED, is made to correspond with the focus P. FIG. It is the figure which showed the optical path inside a light guide based on the effect | action of the light guide demonstrated using FIG.3 and FIG.4. It is explanatory drawing for demonstrating the effect | action of a lens array. It is the figure which showed the optical path inside a light guide based on the effect | action of the lens array demonstrated using FIG. It is the figure which showed the optical path of the light inject | emitted from the projection part of a light guide. It is a schematic structure figure showing composition of a card reader which has a medium gate mechanism concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light guide 2 Light source 3 Incident surface 4 Inclination part 5 Reflection surface 5a 1st reflection part 5b 2nd reflection part 6 Outgoing surface 7 Lens array 8 Chamfer part 9 Protrusion part 9a Inclination part 100 Medium gate mechanism

Claims (9)

In a light guide having an incident surface on which light is incident, an exit surface that emits the incident light, and a reflective surface that faces the exit surface and reflects the incident light,
The reflection surface includes a plurality of first reflection portions that reflect light in a direction substantially perpendicular to the emission surface, and a plurality of second reflection portions formed between the plurality of first reflection portions. ,
The first reflection part is formed to be a paraboloid having a Fresnel shape,
The focal point of the paraboloid is located on an intersection formed when each of the plurality of second reflecting portions is extended ,
The light guide according to claim 1, wherein a plurality of lenses having a focal point at substantially the center of the first reflecting portion are provided on the exit surface . The light guide according to claim 1, wherein the second reflecting portion is a flat surface.   The light guide body according to claim 1, wherein a reflection member that prevents light transmission is provided on the reflection surface. The light guide according to claim 3, wherein the reflecting member is provided on a surface in the vicinity of the focal point of the paraboloid surface among surfaces orthogonal to the reflecting surface. The chamfer at a predetermined angle is applied to a tip of the light guide formed in an elongated shape along the emission surface at a tip opposite to the focal point of the paraboloid. 5. The light guide according to any one of 1 to 4.   The light guide body according to claim 5, wherein the tip is provided with a protrusion protruding in a direction substantially orthogonal to the reflection surface. In a medium gate mechanism in a medium processing apparatus having a gate port into which a medium is inserted and a medium transport mechanism that transports the medium inserted from the gate port to the inside,
The media gate mechanism is:
A gate frame constituting the gate opening;
A medium gate mechanism comprising: a light guide according to claim 1 for guiding light from a light source to the gate frame.   The medium gate mechanism according to claim 7, wherein the light guide and the gate frame are integrally formed.   9. The medium gate mechanism according to claim 7, wherein the gate frame is made of a transparent body and has a matte surface.

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