JP3032382U - Reel sensor - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To easily assemble, to easily obtain assembly accuracy, and to reduce cost. The reel sensor includes a first light guide member 12 which introduces light from a light emitting element 4 and bends and reflects the light, and a first light guide member 12 which introduces light from the first light guide member 12 and bends and reflects the light toward the light receiving element 5. The first light guide member 1 having two light guide members 13
The sensing section 11 of the reel crosses the optical path between the second optical member 13 and the second optical member 13. Then, the light guide portion connecting the first light guide member 12 and the light emitting element 4 and the light guide portion connecting the second light guide member 13 and the light receiving element 5 are formed in a space without surroundings. In addition, the first and second light guide members 12 and 13 are fixed to the window hole 2a provided in the fixing portion 2 to which the reel is attached, and the shielding portion 15 that blocks light emission is arranged between the elements 4 and 5. ing.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a reel sensor, and more specifically, for detecting the rotation state and the rotation speed of a tape reel of a video cassette recorder (VCR), a video cassette player (VCP), an audio cassette recorder, a digital cassette recorder, etc. Related to the improvement of the reel sensor.

[0002]

[Prior art]

 Conventionally, as a reel sensor for this kind of tape, one using a photo interrupter is known. However, when the photo interrupter is used, a special component having a long lead is required, which makes the component difficult to manufacture and expensive, and at the time of assembly or the like, the lead is easily bent and the productivity is reduced. For this reason, recently, as shown in Japanese Patent Laid-Open No. 6-314453, some use an optical member.

As shown in FIG. 7, a reel sensor 50 using this light-guiding member has a pair of light-guiding portions 51 made of a plastic material such as acrylic or polycarbonate or other light-transmitting material. The light guide portions 51, 51 are incorporated so as to stand on a base body 53 placed on the printed board 52. The light guide portions 51 and 51 are appropriately separated from each other so as to allow the sensing protrusion 70 of the reel to pass therethrough. It should be noted that the base body 53 is provided with element housing pockets 54, 54 respectively corresponding to both the light guide portions 51, 51, and is molded with an opaque material in order to prevent light from wrapping around. .

A light emitting element 55 such as an infrared LED is accommodated in one of the element accommodating pockets 54, 54, and a light receiving element 56 such as a phototransistor is accommodated in the other. Each of these elements 55 and 56 has short leads 57 and 58, and the leads 57 and 58 penetrate the printed circuit board 52, respectively, and the lower ends thereof are connected by solder 59 to the circuit provided on the printed circuit board 52. .

On the other hand, at the ends of both the light guides 51, 51, reflecting surfaces 60, 60 having an inclined surface of 45 ° on the outer side are formed by processing such as mirror polishing. These reflecting surfaces 60, 60 reflect the light emitted from the light emitting element 55 and passing through one light guide 51 to the other light guide 51, as shown by the arrows in the figure, and allow the light to enter. The light transmitted through the other light guide section 51 is received by the light receiving element 56. In order to prevent the light emitted from the light emitting element 55 from directly entering the light receiving element 56 in the middle of the base body 53, the surface of the base body 53 is molded with an opaque member, or the light is emitted. Between the element 55 and the light receiving element 56, a light-shielding object made of metal or the like is provided as a light-shielding means.

[0006]

[Problems to be solved by the device]

 However, in the reel sensor 50 shown in FIG. 7, although the leads 57 and 58 are short and the insertability is good, since the light guide portions 51 and 51 are incorporated into the base body 53, it is difficult to assemble and the number of parts is large. The number of integration processes increases. This causes problems such as difficulty in assembling accuracy, lowering production efficiency and increasing costs.

An object of the present invention is to provide a reel sensor which can be easily assembled, can easily be assembled with high accuracy, and can be reduced in cost.

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, in the device according to claim 1, the first light guide member that introduces the light of the light emitting element and bends and reflects it, and the light from the first light guide member that bends and reflects to the light receiving element side is introduced. A reel sensor having a second light-guiding member that allows the sensing section of the reel to cross the light path between the first light-guiding member and the second light-guiding member. The light guide part connecting the two and the second light guide member and the light guide part connecting the second light guide element and the light receiving element are both formed in a space without surroundings, and the reels are attached to the first and second light guide members. It is fixed in a window provided in the fixed part, and a shielding part that blocks light emission is placed between both elements.

According to a second aspect of the invention, in the reel sensor according to the first aspect, a member integrally formed with the first and second light guide members and a light guide member holder for holding the member are provided. The respective members are fixed to the first fixing portion which constitutes the fixing portion, and the shielding portion is provided on the optical member holder. In addition, in the device according to the third aspect, in the reel sensor according to the second aspect, the shielding portion extends beyond the tip of at least one of the two elements, and the shielded portion of the printed board on which the both elements are attached and the shielding portion are provided. There is a gap between it and the tip.

Further, in the invention as set forth in claim 4, in the reel sensor as set forth in claim 1, when the printed circuit board having both elements mounted thereon is placed on the second fixing portion constituting the fixing portion, the mounting is performed. A shielding part is provided on the part.

In addition, in the invention according to claim 5, in the reel sensor according to claim 1, 2, 3 or 4, the inner periphery and the corner portion of the window hole are covered with a resin material.

Further, according to a sixth aspect of the invention, in the reel sensor according to the first, second, third, fourth or fifth aspect, the first and second light guide members are made of a resin material, and the light guide member holder is formed. Integrated and held in.

The reel sensor of the present invention eliminates the light guide portion connecting the first light guide member and the light emitting element and the light guide portion connecting the second light guide member and the light receiving element. Then, the part that constitutes the optical path traversed by the sensing part (hereinafter referred to as the reel sensor tip part) is attached to the window hole of the chassis that becomes the fixed part regardless of the mounting part of the light emitting element or the light receiving element. In addition, a shielding portion that blocks light is provided between the light emitting element and the light receiving element. Therefore, since only the tip portion of the reel sensor can be manufactured separately, the production efficiency is improved, the dimensional accuracy is easily obtained, and the cost is reduced. In addition, the assembly is completed by a simple assembling work, in which the tip of the reel sensor is attached to the window hole of the chassis and the light emitting element and the light receiving element are attached to the substrate, etc., which is the fixed part.

Further, when the shield portion is provided on the optical member holder, the shield portion is automatically arranged between the two elements by attaching the holder to the window hole of the fixed portion, and the assembling efficiency is improved. improves. Further, by providing the shield portion on the fixed portion on which the circuit board is placed, it becomes possible to dispose the shield portion between both elements with high accuracy.

In addition, by covering the inner circumference and the corners of the window hole of the fixed portion with the resin material, the reel sensor tip portion can be smoothly fitted. Moreover, if the first and second light guide members are integrated and held by the light guide member holder formed of a resin material, the reel sensor tip portion can be easily manufactured and fitted into the window hole smoothly. Become.

[0016]

[Embodiment of device]

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

1 to 4 are views showing a first embodiment of the present invention. The reel sensor 1 includes a metal first chassis (first fixing portion) 2 that serves as a fixing portion that holds a reel stand on the winding side of a video cassette recorder, and a second chassis (second fixing portion). Part) 8 and the printed circuit board 3 fixed to the printed circuit board 3. The reel sensor 1 is provided on the light emitting element 4 and the light receiving element 5 mounted on the printed circuit board 3, the tip portion 6 of the reel sensor attached to the first chassis 2, and the tip portion 6 of the reel sensor. And a shield plate 7 serving as a shield portion. A second chassis 8 made of another synthetic resin is provided below the printed circuit board 3 in FIG. 1 so as to sandwich the printed circuit board 3 with the first chassis 2.

A reel 10 having a disk-shaped rotating plate 9 on which a tape holder (not shown) is placed is rotatably supported on a support portion of the reel stand. As shown in FIG. 3, there are four arc-shaped sensing projections 11 projecting downward and separated from each other in the circumferential direction on the lower surface side of the rotary plate 9 along the circumferential direction. It is provided so as to block the optical path of the reel sensor 1. The printed circuit board 3 serving as a circuit board has a circuit pattern printed on the side facing the second chassis 8.

The first chassis 2 constitutes a part of a fixing portion for fixing a reel stand or the like, and a print substrate 3 is placed on it. A window hole 2a is opened in the first chassis 2, and the resin material 2b formed by outsert molding covers the inner periphery and corners of the window hole 2a. The reel sensor tip portion 6 is fitted and fixed in the window 2a. A screwing portion 2c having a screw hole for screwing the reel sensor tip portion 6 is provided on a part of the resin material 2b.

The light emitting element 4 is composed of an infrared LED or the like, its lead portion 4 a penetrates the printed board 3, and its tip side is soldered to the printed board 3. On the other hand, the light receiving element 5 is composed of a phototransistor or the like, and like the light emitting element 4, its lead portion 5a penetrates the print substrate 3 and its front end side is soldered to the printed circuit board 3.

The reel sensor tip portion 6 introduces the light of the light emitting element 4 and introduces the light from the first light guide member 12 and the light guide element 12 which are made of acrylic for bending and reflecting the light to the light receiving element 5 side. The light guide member molded body 14 integrally molded with the second light guide member 13 made of acrylic that bends and reflects, and holds the first and second light guide members 12 and 13, and also protects the shield plate 7 and the shield plate 7 thereof. The shield plate 15 extending in the opposite direction is composed of a light-guiding member holder 16 integrally formed of a black light-impermeable material. Then, in the optical path between the first light guide member 12 and the second light guide member 13, the sensing projection 11 provided on the rotating plate 9 of the reel 10 crosses as the reel 10 rotates. Is formed. The light guide members 12 and 13 may be made of acrylic, plastic material such as polycarbonate, or other light transmitting material.

Then, reflection surfaces 17 and 18 forming an inclined surface of 45 ° are formed on the respective end portions of both the light guide members 12 and 13 by processing such as mirror polishing to form acrylic prisms. The light guide members 12 and 13 may be glass or metal cylinders, and the reflection surfaces 17 and 18 may be metal mirrors formed by aluminum vapor deposition or the like.

The light guide member molded body 14 has a base portion 14 a for supporting the first and second light guide members 12, 13, and a shield plate insertion window hole 14 b is provided in the center of the base portion 14 a. In addition, a screw hole 14c into which a screw 19 for attaching to the chassis 2 is inserted is provided at one end. On the other hand, the light guide member holder 16 has a pedestal portion 16a for supporting the shielding plates 7 and 15, and the pedestal portion 16a is provided for allowing the light of the light emitting element 4 to enter the first light guide member 12. A light emitting guide hole 16b, a light receiving guide hole 16c for guiding the light from the second light guide member 13 to the light receiving element 5, and a screw hole 16d into which the screw 19 for attaching to the chassis 2 is inserted are provided. ing.

The tip 15 a of the shielding plate 15 extends to the tops of the light emitting element 4 and the light receiving element 5, and shields the light receiving portion of the light receiving element 5 from the light emitting element 4. On the other hand, the other end 7a of the shielding plate 7 extends to the vicinity of the rotation region of the sensing protrusion 11. Further, although the first and second light guide members 12 and 13 are one member formed by integral molding, they may be two members. Although it is preferable to provide the shielding plates 7 and 15 together, the shielding plate 7 may be omitted.

The inner periphery and the corners of the window hole 2a are covered with the resin material 2b as described above so that the fitting is smoothly and firmly performed. In addition, the first light guide member 12 and the second light guide member 13 are designed so that the light of the light emitting element 4 is widely introduced and the light is widely applied to the light receiving element 5, so that the respective elements 4 and 5 are widened. The reflection surfaces 17 and 18 are narrowed.

In the reel sensor 1 configured as described above, the light emitted from the light emitting element 4 enters the first light guide member 12 through the light emitting guide hole 16 b of the light guide member holder 16 and is reflected by the reflection surface 17. Then, the light enters the second light guide member 13. At this time, if the sensing protrusion 11 shuts off the optical path, no light enters the second light guide member 13. The light that is not blocked by the sensing protrusion 11 and is incident on the second light guide member 13 is reflected by the reflection surface 18, passes through the light receiving guide hole 16c of the light guide member holder 16, and then is incident on the light receiving element 5. . Accordingly, when the reel 10 is rotating, the light from the light emitting element 4 is intermittently incident on the light receiving element 5, and it is detected that the reel 10 is in a rotating state. On the other hand, when the rotation of the reel 10 is stopped, the light from the light emitting element 4 is always incident on the light receiving element 5 or is blocked by the sensing projection 11 and is not always incident, so that the rotation is stopped. Detect.

That is, when the reel 10 is rotated by the drive of the capstan motor, the tape is wound from the tape holder on the reel 10 and the rotation locus of the sensing projection 11 on the lower surface of the rotating plate 9 of the reel 10 is changed. The optical path of the reel sensor 1 is interrupted intermittently. Then, the reel sensor 1 sends a signal corresponding to the rotation state of the reel 10 to a rotation control unit (not shown). The reel sensor 1 can be added to the reel stand on the supply side in addition to the reel stand on the winding side. In this case, in addition to obtaining an accurate signal, the remaining tape amount can be displayed by detecting the rotation ratio of the reel 10 on the winding side and the reel 10 on the supplying side.

If the reel 10 on the take-up side stops its rotation for some reason even when the rotation of the capstan motor continues, if the reel sensor 1 is not provided, the tape is removed by the capstan. Will continue to be supplied. The tape then slips into the videocassette recorder, making the cassette irremovable and irreparable. However, since the reel sensor 1 is provided, when the rotation of the reel 10 is stopped, the reel sensor 1 detects the stop and sends a signal to the rotation control unit of the capstan motor or another rotating body, which is unnecessary. Immediately stop rotation. As a result, it is possible to prevent the cassette tape from becoming unusable due to excessive supply of tape.

Next, a reel sensor 30 according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 5, the same members as those shown in FIGS. 1 to 4 are designated by the same reference numerals.

The reel sensor 30 is substantially the same as the reel sensor 1 shown in the first embodiment except for the configuration of the reel sensor tip portion 6. That is, the reel sensor tip portion 6 of the reel sensor 30 is made of acrylic resin and has a first light guide member 31 and a second light guide member 32, which are made of a resin material in which a shielding plate 34 is integrally molded. It is configured to be held by the optical member holder 33. Note that one end of the shield plate 34 extends to the pedestal portion 5b of the light receiving element 5 and shields the light receiving portion of the light receiving element 5 from the light emitting element 4. On the other hand, the other end of the shielding plate 34 extends near the rotation region of the sensing protrusion 11. Further, the first and second light guide members 31 and 32 are one member formed by integral molding, but may be two members.

The optical member holder 33 is formed integrally with the first and second optical members 31 and 32 by outsert molding using a resin material and holds both members 31 and 32. . In the light guide member holder 33, a portion facing the light emitting element 4 and radiating light is made into an entrance hole 33a having a round hole, and a portion facing the light receiving element 5 and passing light is also an exit hole 33b having a round hole. It is said that. Then, both side portions 33c, 33c of the light guide member holder 33 are fitted into the window holes 2a of the chassis 2. The inner periphery and the corners of the window hole 2a are covered with the resin material 2b as in the first embodiment, so that the fitting is smoothly and firmly performed. Further, the first light guide member 31 and the second light guide member 32 are designed so that the light from the light emitting element 4 is widely introduced and the light is widely applied to the light receiving element 5, so that the respective elements 4 and 5 are widened. The reflecting surfaces 35 and 36 are narrowed. Further, the light emitting element 4 and the light receiving element 5 are fixed to the printed circuit board 3 as in the first embodiment.

The operation of the reel sensor 30 thus configured is the same as that of the reel sensor 1. That is, the light emitted from the light emitting element 4 passes through the entrance hole 33a, enters the first light guide member 31, is reflected by the reflecting surface 35, and then is not blocked by the sensing projection 11. It is incident on the second light guide member 32. Then, after reflecting on the reflection surface 36, the light passes through the emission hole 33 b and enters the light receiving element 5. The subsequent operation is also the same as in the first embodiment.

Next, a reel sensor 40 according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 6, the same members as those shown in FIGS. 1 to 4 are designated by the same reference numerals.

The reel sensor 40 includes a metal first chassis 2 that serves as a fixing portion that holds the reel stand on the winding side of the video cassette recorder, and a printed circuit board 3 that is fixed to the second chassis 8. Will be placed. The reel sensor 40 is provided on the light emitting element 4 and the light receiving element 5 mounted on the printed board 3, the tip portion 6 of the reel sensor mounted on the first chassis 2, and the second chassis 8. And a shielding plate 8a serving as a shielding portion.

A window hole 2a is opened in the first chassis 2, and an inner periphery and a corner portion of the window hole 2a are covered with a resin material 2b formed by outsert molding. The front end portion 6 of the reel sensor is fitted and fixed in the window hole 2a.

The light emitting element 4 is composed of an infrared LED or the like, the lead portion 4 a thereof penetrates the printed board 3, and the tip side thereof is soldered to the printed board 3. On the other hand, the light receiving element 5 is composed of a phototransistor or the like, and like the light emitting element 4, its lead portion 5a penetrates the print substrate 3 and its front end side is soldered to the printed circuit board 3.

The reel sensor tip portion 6 introduces the light of the light emitting element 4 and bends and reflects the first light guide member 41, and the light receiving element 5 that receives the light from the first light guide member 41. It is composed of a second light guide member 42 made of acrylic that bends and reflects to the side, and a light guide member holder 43 made of a light transmitting material that holds the first and second light guide members 41, 42. The sensing projection 11 provided on the rotating plate 9 of the reel 10 is formed in the optical path between the first light guide member 41 and the second light guide member 42 so as to cross as the reel 10 rotates. Has been done. The light guide members 41 and 42 may be made of acrylic, plastic material such as polycarbonate, or other light transmitting material.

Then, reflection surfaces 44, 45 forming an inclined surface of 45 ° are formed on each end portion of both the light guide members 41, 42 by processing such as mirror polishing to form acrylic prisms. It should be noted that both the light guide members 41 and 42 may be made of glass or a metal tube, and the reflection surfaces 44 and 45 thereof may be metal mirrors.

The second chassis 8 constitutes a part of the fixed portion, and the printed circuit board 3 is mounted on the second chassis 8. The second chassis 8 is provided with a metallic shield plate 8a 1 which serves as a shield. The shielding plate 8a penetrates the printed circuit board 3 and projects so as to block the space between the light emitting element 4 and the light receiving element 5. The shield plate 8a is for shielding unnecessary light from the light emitting element 4 to the light receiving element 5 and interference.

The operation of the reel sensor 40 thus configured is similar to that of the reel sensors 1 and 30. That is, the light emitted from the light emitting element 4 enters the first light guide member 41 from the light guide member holder 43, is reflected by the reflecting surface 44, and is incident on the second light guide member 42. At this time, if the sensing protrusion 11 blocks the optical path, no light enters the second light guide member 42. The light that is not blocked by the sensing projection 11 and is incident on the second light guide member 42 is reflected by the reflection surface 45, passes through the light guide member holder 43, and then is incident on the light receiving element 5. As a result, when the reel 10 is rotating, the light from the light emitting element 4 is intermittently incident on the light receiving element 5, and it is detected that it is in a rotating state. On the other hand, when the rotation of the reel 10 is stopped, the light from the light emitting element 4 is always incident on the light receiving element 5 or is blocked by the sensing projection 11 and is not always incident, and the rotation is stopped. Detect.

It should be noted that each of the above-described embodiments is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. Is. For example, each of the light guide members 12, 13, 31, 32, 41, 42 can be made of a plastic material such as polycarbonate or other light transmitting material other than acrylic. Alternatively, a cylinder formed of a light opaque member may be used, and a mirror surface may be arranged on the reflection surface thereof. Further, the sensing portion of the reel 10 is not used as the sensing protrusion 11, but the light emitted from the first light guide members 12, 31, 41 is reflected on the lower surface side of the rotating plate 9 of the reel 10 and the second light guide member is formed. It is also possible to provide a portion that is incident on 13, 32 and 42 and a portion that is reflected but is not incident on the second light guide member 13, 32 and 42.

Further, as the shielding part, in addition to the shielding plates 7, 15, 34 made of a non-translucent resin molded product and the metallic shielding plate 8 a formed on the second chassis 8, silk printing or the like on a transparent resin, etc. It may be printed with a non-transparent color such as black. Further, as the shielding portion, in addition to the flat plate shape, an arcuate cross-sectional shape that covers a part of the light-emitting element 4 or the light-receiving element 5 or an uneven cross-sectional shape such as a tail is used. The shape of can be adopted. Further, unlike the case of the first embodiment, the reel sensor tip portion 6 is not fixed with the screw 19, but a hook is provided on the optical member molded body 14, the optical member holding body 16, etc. The elasticity of the hook may be used to hook and fix the second window hole 2a.

[0043]

[Effect of device]

 As described above, in the reel sensor according to the first aspect, only the tip portion of the reel sensor can be manufactured separately, so that the production efficiency is improved and the dimensional accuracy is easily obtained. Moreover, it is easy to assemble and the cost is reduced. Further, general-purpose products of various shapes can be used as the light emitting element and the light receiving element, which facilitates the design change and further reduces the cost.

Further, in the device according to the second aspect, since the member in which the two light guide members are integrally molded is used, the number of parts is reduced, the assembling accuracy is improved, and the cost is also reduced. Further, when the optical member holder is attached to the window hole of the first fixing portion which constitutes the fixing portion, the shielding portion is also automatically arranged between the both elements, so that the assembling efficiency is improved. In addition, in the invention according to claim 3, since the shielding portion extends beyond the tip of either the light emitting element or the light receiving element, the shielding is ensured and a gap is provided at the tip of the shielding portion. Therefore, even if there is an error in accuracy, the shielding part does not hit the fixed part such as the printed circuit board, and the assembling accuracy and the assembling efficiency are improved.

Further, in the invention according to claim 4, since the shielding portion penetrates the printed circuit board and is arranged between both elements, the positional relationship among the three elements on the printed circuit board, that is, the light emitting element and the light receiving element The positional relationship among the three elements, the shield and the element, is determined by the printed circuit board, and it is possible to accurately position the shield through the printed circuit board.

Further, in the inventions according to the fifth and sixth aspects, fitting of the tip portion of the reel sensor to the fixed portion becomes smooth. In addition, in the device according to the sixth aspect, since the first and second light guide members are integrated and held by the light guide member holder, the tip of the reel sensor is easily manufactured and the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is a front view of a main portion of a reel portion in which a reel sensor according to a first embodiment of the present invention is used.

FIG. 2 is a cross-sectional view of essential parts showing the reel sensor of FIG.

FIG. 3 is a perspective view of the reel shown in FIG. 1 viewed from the bottom surface thereof.

FIG. 4 is a perspective view of a member used in the tip portion of the reel sensor of FIG.

FIG. 5 is a cross-sectional view of essential parts showing a second embodiment of the reel sensor of the present invention.

FIG. 6 is a cross-sectional view of essential parts showing a third embodiment of the reel sensor of the present invention.

FIG. 7 is a side view of a conventional reel sensor.

[Explanation of symbols]

 1 Reel Sensor 2 Chassis (First Fixed Part) 3 Printed Circuit Board 4 Light Emitting Element 5 Light Receiving Element 6 Reel Sensor Tip Part 7 Shielding Plate (Shielding Part) 8 Chassis (Second Fixed Part) 9 Rotating Plate 10 Reel 11 Sensing Protrusion Piece (sensing part) 12 First light guide member 13 Second light guide member 14 Light guide member molded body 15 Shielding plate (shielding part) 16 Light guide member holding body 17, 18 Reflecting surface

Claims (6)

[Scope of utility model registration request] 1. A first light guide member for introducing light from a light emitting element to bend and reflect the light, and a second light guide member for introducing light from the first light guide member to bend and reflect to the light receiving element side. A reel sensor in which a sensing portion of the reel traverses an optical path between the first light guide member and the second light guide member, wherein a light conductor connecting the first light guide member and the light emitting element The portion and the light guide portion connecting the second light-guiding member and the light-receiving element are both formed in a space without surroundings, and the first and second light-guiding members are fixed to the reel. A reel sensor characterized by being fixed to a window hole provided in, and having a shielding portion disposed between both of the elements to block light emission. 2. A first fixing part which constitutes the fixing part, wherein a member integrally formed with the first and second optical members and an optical member holder for holding the member are provided. The reel sensor according to claim 1, wherein the reel sensor is fixed to the optical member holding member and the shielding portion is provided on the optical member holder. 3. The shield part extends beyond the tip of at least one of the two elements, and a gap is provided between the printed board on which the two elements are attached and the tip of the shield part. The reel sensor according to claim 2, which is characterized in that. 4. The reel sensor according to claim 1, wherein a printed circuit board to which the both elements are attached is mounted on the second fixing portion, and the shielding portion is provided on the mounting portion. 5. The reel sensor according to claim 1, wherein an inner periphery and a corner portion of the window hole are covered with a resin material. 6. The first and second light guide members are integrated and held by a light guide holding member made of a resin material, as set forth in claim 1, 2, 3, 4 or 5. Reel sensor.