JP2019064101A - Light-emitting device - Google Patents

Abstract

To provide a light-emitting device that can improve safety.SOLUTION: A plate making device 2 includes: a light-emitting part 2 with a light source 11; a placing table 3 on which the light-emitting part 2 is placed; and a wrong light emission prevention mechanism 4 for preventing wrong light emission from the light source 11 in accordance with a state of the light-emitting part 2 placed on the placing table 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light emitting device that emits light.

  As a plate-making technique for screen printing, a technique is known in which heat is applied to a heat-sensitive stencil sheet to make a plate (see, for example, Patent Document 1).

  As a plate making apparatus using such a technique, there is known a plate making apparatus for making a heat-sensitive stencil sheet using a light source such as a xenon flash lamp. In this plate-making apparatus, the light source emits light in a state in which the heat-sensitive stencil sheet and the original sheet on which the image is formed by the ink containing carbon and the like are closely attached and placed on the mounting table. As a result, the carbon of the document image is heated to melt the portion of the heat-sensitive stencil sheet corresponding to the document image, and a plate-making image is formed on the heat-sensitive stencil sheet.

JP, 2012-10146, A

  In the light emitting device such as the above-described plate-making apparatus, the user may look directly at the light of the light source when the light source emits light erroneously. When the user directly looks at the light of the light source, the user may be damaged in the eyes. For this reason, there has been a demand for improvement of security for users.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a light emitting device capable of improving safety.

  In order to achieve the above object, a light emitting device according to the present invention comprises a light emitting unit having a light source, a mounting table on which the light emitting unit is mounted, and the light source of the light source according to the mounting state of the light emitting unit with respect to the mounting table. And a false light emission preventing mechanism for preventing false light emission.

  According to the light emitting device of the present invention, the safety can be improved.

It is a perspective view which shows schematic structure of the platemaking apparatus which concerns on 1st Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 1st Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus in 1st Embodiment. It is a figure which shows an example which multiply arranged the mounting base side magnet in 1st Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 2nd Embodiment. It is a figure which shows arrangement | positioning of the mounting base side magnet of the platemaking apparatus which concerns on 2nd Embodiment. (A) is a figure which shows an example which multiply arranged the mounting base side magnet in 2nd Embodiment. (B) is a figure which shows the other example which multiply arranged the mounting base side magnet in 2nd Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 3rd Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus in 3rd Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus in 3rd Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 4th Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 5th Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus in 5th Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus in 5th Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 6th Embodiment. It is a perspective view of the annular electrode of the platemaking apparatus concerning 6th Embodiment, and an internal electrode. It is operation | movement explanatory drawing of the platemaking apparatus in 6th Embodiment. It is a figure which shows the state which the light emission part is not in the normal mounting state in the platemaking apparatus which concerns on 6th Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus which concerns on 7th Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus which concerns on 7th Embodiment. It is sectional drawing which shows schematic structure of the platemaking apparatus in 8th Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus which concerns on 8th Embodiment. It is operation | movement explanatory drawing of the platemaking apparatus which concerns on 8th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or equivalent parts or components are denoted by the same or equivalent reference numerals throughout the drawings.

  The embodiment shown below exemplifies an apparatus etc. for embodying the technical idea of this invention, and the technical idea of this invention is the material, shape, structure, arrangement etc. of each component. Does not specify the following. Various changes can be added to the technical idea of the present invention within the scope of the claims.

First Embodiment
FIG. 1 is a perspective view showing a schematic configuration of a plate making apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a schematic configuration of the plate making apparatus according to the first embodiment. In the following description, upper, lower, left, right, front and rear indicated by arrows in FIG.

  As shown in FIGS. 1 and 2, a plate-making apparatus (corresponding to a light emitting device in the claims) 1 according to the first embodiment includes a light emitting unit 2, a mounting table 3, and an erroneous light emission preventing mechanism 4. Here, the plate making apparatus 1 is a split type plate making apparatus which is not physically connected to the light emitting unit 2 mounting table 3.

  The light emitting unit 2 emits light for making the heat sensitive stencil sheet 5. The light emitting unit 2 includes a light source 11, a power supply 12, and a housing 13.

  The light source 11 emits light for melting the heat-sensitive stencil sheet 5 to form a plate-making image. The light source 11 is, for example, a xenon flash lamp.

  The power supply 12 supplies power for causing the light source 11 to emit light.

  The housing 13 accommodates the light source 11, the power source 12, and the like. The housing 13 is provided with a handle 14 for the user to hold. In addition, a window (not shown) for transmitting the light of the light source 11 is provided on the bottom surface of the housing 13.

  The mounting table 3 is a table on which the light emitting unit 2 is mounted via the original 6 and the heat-sensitive stencil sheet 5 at the time of plate making. The light emitting unit 2 is mounted on the upper surface (mounting surface) 3 a of the mounting table 3 which is a horizontal surface via the original 6 and the heat-sensitive stencil sheet 5. The mounting table 3 may be made of metal or the like that is adsorbed to the magnet, or may be made of wood or the like that is not adsorbed to the magnet.

  Here, the heat-sensitive stencil sheet 5 is a sheet in which a thermoplastic film is attached to a porous support. The original 6 is a sheet on which an image is formed with ink or toner containing carbon.

  The erroneous light emission preventing mechanism 4 is a mechanism that prevents erroneous light emission of the light source 11 according to the mounting state of the light emitting unit 2 on the mounting table 3. The erroneous light emission preventing mechanism 4 includes contact point pairs 16A and 16B, light emitting unit side magnets 17A and 17B, and a mounting table side magnet 18. The suffixes of the alphabets in the reference numerals of the contact pairs 16A, 16B, etc. may be abbreviated and may be generally described.

  The contact pairs 16A and 16B are contact pairs that switch between conduction and interruption of current to the light source 11. The contact pairs 16A and 16B are disposed in the light emitting unit 2. Specifically, in the light emitting unit 2, the contact pairs 16A and 16B are provided in an electric circuit for causing the light source 11 to emit light by the power of the power supply 12. The contact pair 16A comprises a pair of contacts 21A and 22A, and the contact pair 16B comprises a pair of contacts 21B and 22B.

  The contact 21 is formed of a metal plate spring. One end of the contact 21 is fixed to a support 26 provided in the housing 13 and is supported horizontally. The contact points 21A and 21B are disposed apart from each other in the left-right direction. The contacts 21A and 21B are electrically connected to each other.

  The contact points 22A and 22B are respectively spaced above the contact points 21A and 21B. The contact points 22A and 22B are supported by support portions 27A and 27B provided in the housing 13, respectively. The contacts 22A and 22B are electrically connected to each other through the light source 11 and the power supply 12.

  The light emitting unit side magnets 17A and 17B are for lifting the other end (free end) sides of the contacts 21A and 21B, respectively, by the repulsive force with the mounting table side magnet 18. The light emitting unit magnets 17A and 17B are attached to the lower surfaces of the contacts 21A and 21B, respectively. The light emitting unit side magnets 17A and 17B are disposed at predetermined intervals in the left-right direction.

  The light emitting unit side magnet 17A is attached to the contact 21A with the N pole facing downward, and the light emitting unit side magnet 17B is attached to the contact 21B with the S pole facing downward. Thereby, when the light emitting unit side magnets 17A and 17B are mounted such that the light emitting unit 2 is in the normal mounting state with respect to the mounting table 3, the light emitting unit side magnets 17A and 17B repel the mounting table side magnet 18 There is. Here, immediately below the light emitting unit side magnets 17A and 17B, an opening for exposing the light emitting unit side magnets 17A and 17B is provided on the bottom surface of the housing 13.

  The mounting table magnet 18 is a magnet that generates a repulsive force between the light emitting unit magnets 17A and 17B for causing the light emitting unit magnets 17A and 17B to contact the contacts 21A and 21B with the contacts 22A and 22B, respectively.

  The mounting table side magnet 18 is attached to the mounting table 3, and is arrange | positioned at the upper surface 3a side. The mounting base magnet 18 is attached to the mounting base 3 so that the N pole and the S pole thereof are arranged at predetermined positions side by side in the left-right direction.

  Here, the repulsive force F between the light emitting unit side magnet 17 and the mounting table side magnet 18 when the light emitting unit 2 is mounted in a normal mounting state with respect to the mounting table 3 is expressed by the following formula (1) Is represented by

F = m1 × m2 / (4 × π × μ × r ² ) (1)
Here, m1 is the magnetic force of the light emitting unit side magnet 17. m2 is a magnetic force of the mounting table side magnet 18; μ is the magnetic permeability of the space between the light emitting unit side magnet 17 and the mounting table side magnet 18 and can be regarded as equivalent to the magnetic permeability of vacuum. r is the distance between the light emitting unit side magnet 17 and the mounting table side magnet 18 when the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state.

  Further, when a load is applied to the position of the light emitting unit side magnet 17 of the leaf spring forming the contact point 21, the deflection δ of the leaf spring at that position is expressed by the following equation (2).

δ = (4 × p × l ³ ) × (1−v ² ) / (E × b × t ³ ) (2)
Here, p is a load applied to the position of the light emitting unit side magnet 17 of the plate spring forming the contact 21. Reference symbol l denotes the distance from the end of the support 26 in the leaf spring forming the contact 21 to the position of the light emitting unit side magnet 17. ν is the Poisson's ratio of the leaf spring forming the contact 21. E is the longitudinal elastic modulus of the leaf spring forming the contact 21. b is the width of a leaf spring forming the contact 21; t is the thickness of a leaf spring that forms the contact 21.

  When the repulsive force F obtained from the above equation (1) is substituted into the load p of the equation (2), the contact point 21 when the light emitting unit 2 is placed on the mounting table 3 in a normal mounting state Deflection is required. The distance between the contacts 21 and 22 is determined based on the deflection of the contact 21 when the light emitting unit 2 is placed in the normal mounting state with respect to the mounting table 3 as described above. The contact 21 is set to be in contact with the contact 22 when it is placed in a normal mounting state.

  Further, when gravity acting on the light emitting unit side magnet 17 is substituted for the load p of the equation (2), deflection of the contact 21 due to gravity of the light emitting unit side magnet 17 when the light emitting unit 2 is turned upside down is obtained. . The distance between the contacts 21 and 22 is determined as described above, and the contact 21 does not contact the contact 22 even if the light emitting unit 2 is turned upside down based on the deflection of the contact 21 when the light emitting unit 2 is turned upside down. Is set as.

  Next, the operation of the plate making apparatus 1 will be described.

  When plate-making of the heat-sensitive stencil sheet 5 by the plate making apparatus 1, the user places the original 6 on the upper surface 3 a of the mounting table 3 and places the heat-sensitive stencil sheet 5 thereon.

  Next, the user places the light emitting unit 2 on the upper surface 3 a of the mounting table 3 via the document 6 and the heat-sensitive stencil sheet 5.

  Under the present circumstances, the light emission part 2 is mounted in the mounting base 3 so that it may be in a normal mounting state. In the normal mounting state of the light emitting unit 2, the light emitting unit side magnet 17 A faces the N pole of the mounting table side magnet 18 with respect to the mounting table 3, and the light emitting unit side magnet 17 B is at the S pole of the mounting table side magnet 18 It is in the state of being placed at the opposite position.

  Thereby, a repulsive force acts between the light emitting unit side magnets 17A and 17B and the mounting table side magnet 18. Due to this repulsive force, as shown in FIG. 3, the free end sides of the contacts 21A and 21B are lifted, and the contacts 21A and 21B come into contact with the contacts 22A and 22B, respectively. As a result, when the contact pairs 16A and 16B become conductive, a current is supplied to the light source 11, and the light source 11 emits light.

  When the light source 11 emits light, the infrared light emitted from the light source 11 generates heat of carbon forming the image of the document 6 and the portion corresponding to the image of the heat-sensitive stencil sheet 5 is melted to make the thermosensitive stencil 5 Be done.

  Here, except in a state where the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, the contacts 21A and 21B of the contact pairs 16A and 16B and the contacts 22A and 22B are separated from each other. For example, in a state where the light emitting unit 2 is separated from the mounting table 3, the contacts 21A and 21B of the contact pairs 16A and 16B and the contacts 22A and 22B are separated from each other. In addition, even if the light emitting unit 2 is mounted on the mounting table 3, when the light emitting unit 2 is not disposed in a normal mounting state, the repulsive force between the light emitting unit side magnets 17A and 17B with the mounting table side magnet 18 acts do not do. Therefore, also in this case, the contacts 21A, 21B of the contact pairs 16A, 16B and the contacts 22A, 22B are separated from each other.

  Therefore, the current to the light source 11 is interrupted and the light source 11 does not emit light except in a state where the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state. That is, erroneous light emission of the light source 11 is prevented. For this reason, it is avoided that the user directly looks at the light of the light source 11 through the window portion on the bottom surface of the housing 13.

  As described above, the plate-making apparatus 1 includes the erroneous light emission preventing mechanism 4 for preventing the erroneous light emission of the light source 11 according to the mounting state of the light emitting unit 2 on the mounting table 3. As a result, the light source 11 does not emit light except in a state in which the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, so that the user directly looks at the light of the light source 11 and receives damage to eyes It is avoided. Therefore, according to the plate making apparatus 1, the safety can be improved.

  Specifically, when the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, the false light emission preventing mechanism 4 is between the light emitting unit side magnet 17 and the mounting table side magnet 18. The contact force of one of the contact pairs 16 makes the light source 11 emit light by contact with the other contact 22. That is, except in a state where the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, the contact 21 and the contact 22 are prevented from contacting each other, so that erroneous light emission of the light source 11 is prevented. Ru. Thereby, the erroneous light emission of the light source 11 can be reduced by the simple mechanism using a magnet.

  In addition, since the light source 11 does not emit light unless the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, the pressure on the mounting table 3 of the light emitting unit 2 through the original 6 and the thermosensitive stencil sheet 5 is insufficient. It is possible to reduce plate making defects.

  A plurality of mounting table side magnets 18 may be provided. For example, as shown in FIG. 4, two mounting table side magnets 18 may be provided. When a plurality of mounting table side magnets 18 are provided, a plurality of normal mounting states of the light emitting unit 2 with respect to the mounting table 3 are obtained, and the convenience is improved.

Second Embodiment
Next, a second embodiment in which a part of the above-described first embodiment is modified will be described. FIG. 5 is a cross-sectional view showing a schematic configuration of a plate making apparatus according to a second embodiment. FIG. 6 is a view showing the arrangement of mounting table magnets of the plate making apparatus according to the second embodiment.

  As shown in FIG. 5, a plate-making apparatus 1A according to the second embodiment has a configuration in which the erroneous light emission preventing mechanism 4 is replaced with the erroneous light emission preventing mechanism 4A in the plate-making apparatus 1 of the first embodiment described above.

  The erroneous light emission preventing mechanism 4 </ b> A includes a contact pair 31, the light emitting unit side magnet 32, and the mounting table side magnet 33.

  The contact pair 31 is similar to the contact pair 16 of the first embodiment described above. The contact pair 31 is a pair of a contact 36 having the same configuration as the contact 21 of the first embodiment and a contact 37 having the same configuration as the contact 22 of the first embodiment. The contacts 36 and 37 are electrically connected to each other through the light source 11 and the power supply 12.

  One end of the contact 36 is fixed to a support 38 provided in the housing 13 and is supported horizontally. The contact 37 is spaced above the contact 36. The contact 37 is supported by a support 39 provided in the housing 13.

  The light emitting unit side magnet 32 is the same as the light emitting unit side magnet 17 of the first embodiment described above. The light emitting unit side magnet 32 is attached to the lower surface of the contact 36 with the N pole facing downward. Here, immediately below the light emitting unit side magnet 32, an opening for exposing the light emitting unit side magnet 32 is provided on the bottom surface of the housing 13.

  The mounting base magnet 33 is a magnet that generates a repulsive force between the light emitting unit side magnet 32 and the light emitting unit side magnet 32 for causing the contact point 36 to contact the contact point 37. The mounting table side magnet 33 is attached to the mounting table 3, and is arrange | positioned at the upper surface 3a side. The mounting table side magnet 33 is attached to the upper surface 3 a side of the mounting table 3 with the N pole facing upward, as shown in FIGS. 5 and 6. The mounting base magnet 33 is disposed at a predetermined position in plan view.

  The normal mounting state of the light emitting unit 2 in the plate making apparatus 1A of the second embodiment is a state where the light emitting unit side magnet 32 is mounted at a position facing the mounting table side magnet 33 with respect to the mounting table 3.

  When the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, the contact point 36 contacts the contact 37 by the repulsive force between the light emitting unit side magnet 32 and the mounting table side magnet 33. Thereby, the light source 11 emits light. Except in a state where the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state, the contacts 36 and 37 are separated from each other, and the light source 11 does not emit light.

  As described above, also in the second embodiment, the light emission unit 4 does not emit light except when the light emitting unit 2 is mounted on the mounting table 3 in the normal mounting state by the erroneous light emission preventing mechanism 4A. Therefore, the security can be improved by the plate making apparatus 1A of the second embodiment as well as the first embodiment.

  Also in the second embodiment, as in the first embodiment, erroneous light emission of the light source 11 can be reduced by a simple mechanism using a magnet.

  A plurality of mounting table side magnets 33 may be provided. For example, as shown in FIG. 7A, two mounting table side magnets 33 may be provided. Also, for example, as shown in FIG. 7B, four mounting table side magnets 33 may be provided. When a plurality of mounting table side magnets 33 are provided, a plurality of normal mounting states of the light emitting unit 2 with respect to the mounting table 3 are obtained, and the convenience is improved.

  In the plate making apparatus 1A described above, the light emitting unit side magnet 32 has the N pole facing downward, and the mounting table side magnet 33 has the N pole facing upward, but the directions of the N and S poles are reversed. Good. The light emitting unit side magnet 32 and the mounting table side magnet 33 may be installed so that the same polarity is opposite when the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state.

Third Embodiment
Next, a third embodiment in which a part of the above-described first embodiment is modified will be described. FIG. 8 is a cross-sectional view showing a schematic configuration of a plate making apparatus according to a third embodiment.

  As shown in FIG. 8, the plate-making apparatus 1B according to the third embodiment replaces the light-emitting unit 2 with the light-emitting unit 2A with respect to the plate-making apparatus 1 according to the first embodiment described above. The configuration is replaced with mechanism 4B.

  The light emitting unit 2A has a configuration in which the housing 13 is replaced with a housing 13A in the light emitting unit 2 of the first embodiment described above.

  The housing 13A includes a lower cover 41, an upper cover 42, and pressure springs 43A and 43B.

  The lower cover 41 is a member that constitutes the lower part of the housing 13A. At the bottom of the lower cover 41, a window (not shown) for transmitting the light of the light source 11 is provided.

  The upper cover 42 is a member that constitutes the upper portion of the housing 13A. The upper cover 42 is configured to be able to move up and down with respect to the lower cover 41 in accordance with a pressure from above on the housing 13A. The upper cover 42 is provided with a handle (not shown) for the user to hold.

  The pressure springs 43A and 43B are members that support the upper cover 42 so as to be able to move up and down. The pressure springs 43A and 43B are disposed at the left end and the right end in the housing 13A, respectively. The lower ends of the pressure springs 43A and 43B are fixed to the bottom surface of the lower cover 41. The upper ends of the pressure springs 43A and 43B are fixed to support portions 44A and 44B provided on the upper cover 42, respectively.

  The erroneous light emission preventing mechanism 4B has a configuration in which the contact pairs 16A and 16B in the first embodiment described above are replaced with contact pairs 46A, 46B, 47A and 47B. The contact pairs 47A and 47B correspond to the pressure detection contact pairs in the claims.

  The contact pair 46A, 46B is a contact pair that switches between conduction and disconnection of the current to the light source 11 depending on whether the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state. The contact pair 16A comprises a pair of contacts 51A, 52A, and the contact pair 16B comprises a pair of contacts 51B, 52B.

  The contacts 51A and 52A have the same configuration as the contacts 21A and 21B of the first embodiment, respectively. One end of the contact point 51 is fixed to a support portion 56 provided on the lower cover 41, and the contact point 51 is horizontally supported. The contact points 51A and 51B are disposed apart from each other in the left-right direction. The contacts 51A and 51B are electrically connected to each other. The light emitting unit side magnets 17A and 17B are attached to the lower surfaces of the contact points 51A and 51B, respectively. Here, immediately below the light emitting unit side magnets 17A and 17B, the bottom surface of the lower cover 41 is provided with an opening for exposing the light emitting unit side magnets 17A and 17B.

  The contact points 52A and 52B are disposed above the contact points 51A and 51B, respectively. The contact points 52A and 52B are supported by support portions 57A and 57B provided on the lower cover 41, respectively. The distance between the contact 52 and the contact 51 is set to be the same as the distance between the contacts 21 and 22 in the first embodiment.

  The contact pair 47A, 47B is a contact pair that switches between conduction and interruption of the current to the light source 11 in accordance with the pressure from above on the light emitting unit 2A. The contact pair 47A comprises a pair of contacts 58A, 59A, and the contact pair 47B comprises a pair of contacts 58B, 59B.

  The contact points 58A and 58B are integrally formed with the contact points 52A and 52B via the connection portions 60A and 60B, respectively.

  The contacts 59A and 59B are disposed above the contacts 58A and 58B, respectively. The contact points 59A and 59B are supported by support portions 61A and 61B provided on the upper cover 42, respectively. The contacts 59A, 59B are electrically connected to each other via the light source 11 and the power supply 12.

  The contact point 59 moves up and down together with the upper cover 42 in accordance with the pressure from above on the light emitting unit 2A. Thereby, the contacts 58 and 59 come in contact with and separate from each other in accordance with the pressing force from above to the light emitting unit 2A.

  Similarly to the first embodiment, the light emitting unit side magnet 17A faces the N pole of the mounting table side magnet 18 with respect to the mounting table 3 in the normal mounting state of the light emitting unit 2A in the plate making apparatus 1B of the third embodiment. The light emitting unit side magnet 17B is placed at a position facing the S pole of the mounting table side magnet 18.

  When the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, the repulsive force between the light emitting unit side magnet 17 and the mounting table side magnet 18 causes the contact points 51A and 52A to be as shown in FIG. Respectively contact the contacts 52A and 52B. However, when no pressure is applied to the light emitting unit 2A from above, the contacts 58 and 59 are separated from each other as shown in FIG. For this reason, the light source 11 does not emit light.

  With the light emitting unit 2A mounted on the mounting table 3 in a normal mounting state, the user applies a pressing force to the light emitting unit 2A from above, and as shown in FIG. 10, the contacts 58A and 58B are contacts When contacting 59A, 59B, current is supplied to the light source 11, and the light source 11 emits light.

  As described above, the erroneous light emission prevention mechanism 4B of the third embodiment includes the contact pair 47A, 47B that switches between conduction and interruption of the current to the light source 11 according to the pressure from above on the light emitting unit 2A. As a result, even if the contacts 51A and 52A are in contact with the contacts 52A and 52B in a normal mounting state of the light emitting unit 2A, the light source 11 does not emit light unless a pressing force is applied to the light emitting unit 2A. False light emission can be further reduced.

  In addition, it is possible to further reduce plate making defects due to insufficient pressure contact of the light emitting unit 2A with the original 6 and the heat sensitive stencil sheet 5 to the mounting table 3.

  Also in the third embodiment, a plurality of mounting table side magnets 18 may be provided as in the first embodiment.

Fourth Embodiment
Next, a fourth embodiment in which a portion of the third embodiment described above is modified will be described. FIG. 11 is a cross-sectional view showing a schematic configuration of a plate making apparatus according to a fourth embodiment.

  As shown in FIG. 11, a plate-making apparatus 1C according to the fourth embodiment has a configuration in which the erroneous light emission preventing mechanism 4B is replaced with the erroneous light emission preventing mechanism 4C in the plate-making apparatus 1B of the third embodiment described above.

  The erroneous light emission preventing mechanism 4 </ b> C includes contact pairs 66 and 67, a light emitting unit side magnet 32, and a mounting table side magnet 33.

  The contact pair 66 is similar to the contact pair 46 of the third embodiment described above. The contact pair 66 includes a contact 71 having the same configuration as the contact 51 of the third embodiment and a contact 72 having the same configuration as the contact 52 of the third embodiment.

  One end of the contact point 71 is fixed to a support portion 73 provided on the lower cover 41, and the contact point 71 is horizontally supported. The contact point 72 is spaced apart above the contact point 71. The contact point 72 is supported by a support portion 74 provided on the lower cover 41.

  The contact pair 67 is similar to the contact pair 47 of the third embodiment described above. The contact pair 67 includes a contact 75 having the same configuration as the contact 58 of the third embodiment and a contact 76 having the same configuration as the contact 59 of the third embodiment.

  The contact point 75 is integrally formed with the contact point 72 via the connection portion 77. The contact 76 is spaced above the contact 75. The contact point 76 is supported by a support 78 provided on the upper cover 42. The contact point 76 is electrically connected to the contact point 71 via the light source 11 and the power source 12.

  The light emitting unit side magnet 32 is the same as that described in the second embodiment. The light emitting unit side magnet 32 is attached to the lower surface of the contact 71 with the N pole facing downward. Here, an opening for exposing the light emitting unit side magnet 32 is provided on the bottom surface of the lower cover 41 immediately below the light emitting unit side magnet 32.

  The mounting base magnet 33 is the same as that described in the second embodiment.

  The normal mounting state of the light emitting unit 2A in the plate making apparatus 1C of the fourth embodiment is the same as in the second embodiment, at the position where the light emitting unit side magnet 32 faces the mounting table side magnet 33 with respect to the mounting table 3 It is in the state of being placed.

  When the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, the contact point 71 contacts the contact point 72 due to the repulsive force between the light emitting unit side magnet 32 and the mounting table side magnet 33. However, when no pressure is applied to the light emitting portion 2A from above, the contacts 75 and 76 are separated from each other, and the light source 11 does not emit light.

  When the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, the user applies a pressing force to the light emitting unit 2A from above, and when the contacts 75 and 76 contact each other, the current to the light source 11 Is supplied, and the light source 11 emits light.

  As described above, also in the fourth embodiment, the erroneous light emission preventing mechanism 4C applies a pressing force to the light emitting unit 2A even if the contacts 71 and 72 are in contact with each other in the normal mounting state of the light emitting unit 2A. Since the light source 11 does not emit light if it is not, false light emission of the light source 11 can be reduced.

  In addition, it is possible to further reduce plate making defects due to insufficient pressure contact of the light emitting unit 2A with the original 6 and the heat sensitive stencil sheet 5 to the mounting table 3.

  Also in the fourth embodiment, a plurality of mounting table side magnets 33 may be provided as in the second embodiment. Further, the directions of the N pole and the S pole of both the light emitting unit side magnet 32 and the mounting table side magnet 33 may be reversed.

Fifth Embodiment
Next, a fifth embodiment in which a part of the fourth embodiment described above is modified will be described. FIG. 12 is a cross-sectional view showing a schematic configuration of a plate making apparatus according to the fifth embodiment.

  As shown in FIG. 12, a plate-making apparatus 1D according to the fifth embodiment has a configuration in which the erroneous light emission preventing mechanism 4C is replaced with an erroneous light emission preventing mechanism 4D in the plate-making apparatus 1C of the fourth embodiment described above.

  The erroneous light emission preventing mechanism 4D includes a contact pair 81, a stopper 82, a light emitting unit side magnet 83, a pullback spring 84, and a mounting table side magnet 33.

  The contact point pair 81 is a contact point pair that switches between conduction and interruption of the current to the light source 11 according to the pressure from above on the light emitting unit 2A. The contact pair 81 is comprised of a pair of contacts 86 and 87. The contacts 86 and 87 are electrically connected to each other via the light source 11 and the power source 12.

  The contact 86 is supported by a support 88 provided on the lower cover 41. The contact point 87 is spaced above the contact point 86. The contact point 87 is supported by a support portion 89 provided on the upper cover 42. The contact point 87 moves up and down together with the upper cover 42 in accordance with the pressure from above on the light emitting unit 2A. Thereby, the contacts 86 and 87 come in contact with and separate from each other in accordance with the pressing force from the upper side with respect to the light emitting unit 2A.

  The stopper 82 can lower the upper cover 42 to a position where the upper cover 42 can be lowered to a position where the contacts 86 and 87 of the contact pair 81 contact each other and to a position where the contacts 86 and 87 of the contact pair 81 contact each other It switches between states.

  The stopper 82 is pivotable about a pivot shaft 82a parallel to the front-rear direction. Thus, the stopper 82 can be switched between the locked state and the unlocked state.

  The locked state of the stopper 82 is a state in which the upper cover 42 can not be lowered to a position where the contacts 86 and 87 of the contact pair 81 contact each other. Specifically, as shown in FIG. 12, the locked state of the stopper 82 is a state in which the longitudinal direction of the stopper 82 is directed vertically. At this time, the lower end of the stopper 82 is in contact with the bottom surface of the lower cover. In this locked state, even if the upper cover 42 is pushed downward, the upper cover 42 does not go down below the position where the projection 90 provided on the upper surface of the upper cover 42 abuts on the upper end of the stopper 82, The contacts 86, 87 do not contact each other.

  The unlocked state of the stopper 82 is a state in which the upper cover 42 can be lowered to a position where the contacts 86 and 87 of the contact pair 81 contact each other. Specifically, as shown in FIG. 13, the unlocked state of the stopper 82 is a tilted state from the locked state.

  The light emitting unit side magnet 83 is configured to switch the stopper 82 from the locked state to the unlocked state by rising with respect to the bottom surface of the lower cover 41. The light emitting unit side magnet 83 is disposed in the housing 13A with the N pole facing downward. Here, immediately below the light emitting unit side magnet 83, the bottom surface of the lower cover 41 is provided with an opening for exposing the light emitting unit side magnet 83.

  The light emitting unit side magnet 83 is provided with an interlocking shaft 83 a for switching the stopper 82 from the locked state to the unlocked state interlocked with the rise of the light emitting unit side magnet 83. The interlocking shaft 83 a is inserted into an interlocking hole 82 b formed in the stopper 82. Thus, when the light emitting unit side magnet 83 is lifted by the repulsive force between the light emitting unit side magnet 33 and the mounting base side magnet 33, the stopper 82 is rotated counterclockwise in FIG. Do.

  The pullback spring 84 rotates the stopper 82 clockwise in FIG. 12 in order to return the stopper 82 from the unlocked state to the locked state. One end of the pullback spring 84 is fixed to a support portion 91 provided on the lower cover 41. The other end of the pullback spring 84 is connected to the lower side than the pivot shaft 82 a of the stopper 82.

  In a state where the repulsive force does not act on the light emitting unit side magnet 83, the lower end portion of the stopper 82 abuts on the convex portion 92 provided on the bottom surface of the lower cover 41 by the tensile force of the pullback spring 84. It is locked. Even when the light emitting portion 2A is turned upside down, the stopper 82 is maintained in the locked state by the pulling force of the pullback spring 84.

  The mounting base magnet 33 is the same as that described in the second embodiment.

  As in the second embodiment, the normal mounting state of the light emitting unit 2A in the plate making apparatus 1D of the fifth embodiment is the position where the light emitting unit side magnet 32 faces the mounting table side magnet 33 with respect to the mounting table 3 It is in the state of being placed.

  When the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, the repulsive force between the light emitting unit side magnet 32 and the mounting table side magnet 33, as shown in FIG. As a result, the stopper 82 is switched from the locked state to the unlocked state.

  In this state, a pressing force from above is applied to the light emitting unit 2A by the user, and as shown in FIG. 14, when the contacts 86 and 87 come in contact with each other, a current is supplied to the light source 11, and the light source 11 emits light.

  When the light emitting unit 2A is released from the mounting table 3 after plate making, the repulsive force between the light emitting unit side magnet 32 and the mounting table side magnet 33 disappears, and the stopper 82 is unlocked by the pulling force of the pullback spring 84. Is returned to the locked state.

  As described above, in the erroneous light emission prevention mechanism 4D of the fifth embodiment, when the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, the light emitting unit side magnet 32 and the mounting table side magnet 33 The stopper 82 is switched from the locked state to the unlocked state by the repulsive force between them. As a result, the light source 11 can emit light due to the pressure from above on the light emitting unit 2A. That is, except in a state where the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, since the stopper 82 is in the locked state, erroneous light emission of the light source 11 is prevented. Thereby, the erroneous light emission of the light source 11 can be reduced by the simple mechanism using a magnet.

  Also in the fifth embodiment, the light source 11 does not emit light unless the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state. Therefore, as in the first embodiment, the document 6 and the heat sensitive stencil sheet 5 It is possible to reduce plate-making defects caused by insufficient pressure contact of the light emitting unit 2A to the mounting table 3 via the

  Also in the fifth embodiment, a plurality of mounting table side magnets 33 may be provided as in the second embodiment. Further, the directions of the N pole and the S pole of both the light emitting unit side magnet 83 and the mounting table side magnet 33 may be reversed.

Sixth Embodiment
Next, a sixth embodiment in which a portion of the third embodiment described above is modified will be described. FIG. 15 is a cross-sectional view showing a schematic configuration of a plate making apparatus according to the sixth embodiment. FIG. 16 is a perspective view of an annular electrode and an internal electrode of a plate making apparatus according to a sixth embodiment.

  As shown in FIG. 15, a plate-making apparatus 1E according to the sixth embodiment has a configuration in which the erroneous light emission preventing mechanism 4B is replaced with the erroneous light emission preventing mechanism 4E in the plate-making apparatus 1B of the third embodiment described above.

  The false light emission preventing mechanism 4E includes a contact pair 93 and a tilt detection unit 94.

  The contact point pair 93 is a contact point pair that switches between conduction and interruption of the current to the light source 11 in accordance with the pressure from above on the light emitting unit 2A. The contact pair 93 is comprised of a pair of contacts 96 and 97.

  The contact 96 is supported by a support 98 provided on the lower cover 41. The contact point 96 is connected to the switching circuit 103 of the inclination detection unit 94 described later. The contact 97 is spaced above the contact 96. The contact 97 is supported by a support 99 provided on the upper cover 42. The contact point 97 is connected to the switching circuit 103 via the power supply 12. The contact point 97 is raised and lowered together with the upper cover 42 in accordance with the pressure from above on the light emitting unit 2A. Thereby, the contact points 96 and 97 come in contact with and separate from each other in accordance with the pressing force from above to the light emitting unit 2A.

  The inclination detection unit 94 switches between conduction and interruption of current to the light source 11 according to the inclination of the light emitting unit 2A. The inclination detection unit 94 includes an annular electrode 101, an internal electrode 102, and a switching circuit 103.

  The annular electrode 101 is an annular electrode that is in contact with or not in contact with the internal electrode 102 in accordance with the inclination of the light emitting unit 2A. The annular electrode 101 is fixed to the lower cover 41 of the light emitting unit 2A and tilts with the tilt of the light emitting unit 2A. The annular electrode 101 is connected to the switching circuit 103.

  The internal electrode 102 is a rod-like electrode which is in contact with or not in contact with the annular electrode 101 in accordance with the inclination of the light emitting unit 2A. The internal electrode 102 is suspended inside the ring formed by the annular electrode 101, as shown in FIG. The upper end of the internal electrode 102 is connected to a support portion 105 provided on the upper cover 42 via a universal joint 104. Thereby, the internal electrode 102 is installed in the light emitting unit 2A so as to maintain the vertical posture regardless of the inclination of the light emitting unit 2A. When the annular electrode 101 is inclined at a predetermined angle or more, the internal electrode 102 is in contact with the annular electrode 101. The internal electrode 102 is connected to the switching circuit 103.

  The switching circuit 103 enables conduction of current to the light source 11 when the internal electrode 102 is not in contact with the annular electrode 101, and when the internal electrode 102 contacts the annular electrode 101 by tilting the light emitting portion 2A Is a circuit that cuts off the current of

  The normal mounting state of the light emitting unit 2A in the plate making apparatus 1E of the sixth embodiment is a state in which the light emitting unit 2A is mounted on the mounting table 3 without being inclined in the horizontal direction.

  In a state where the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state without inclination, the annular electrode 101 has no inclination, and the internal electrode 102 does not contact the annular electrode 101. That is, the annular electrode 101 and the internal electrode 102 are nonconductive. In this state, a pressing force from above is applied to the light emitting unit 2A by the user, and as shown in FIG. 17, when the contacts 96 and 97 contact each other, current is supplied to the light source 11 via the switching circuit 103. 11 emits light.

  When the light emitting portion 2A is inclined at a predetermined angle or more, the internal electrode 102 contacts the annular electrode 101. In this state, it is assumed that the user applies a pressing force to the light emitting unit 2A from above, and as shown in FIG. 18, the contacts 96 and 97 come in contact with each other. In this case, a current flows to the annular electrode 101 and the internal electrode 102 through the switching circuit 103, and the current to the light source 11 is cut off.

  That is, in a state where the light emitting portion 2A is inclined at a predetermined angle or more and the internal electrode 102 contacts the annular electrode 101, no current is supplied to the light source 11 even if the contacts 96 and 97 contact each other, and the light source 11 does not emit light .

  As described above, in the sixth embodiment, the erroneous light emission preventing mechanism 4E includes the inclination detection unit 94 that switches between conduction and interruption of the current to the light source 11 according to the inclination of the light emitting unit 2A. Thereby, in a state where the light emitting unit 2A is inclined at a predetermined angle or more, the light emission of the light source 11 is avoided even if the contacts 96 and 97 contact each other. For this reason, the erroneous light emission of the light source 11 in the state which the light emission part 2A inclined can be reduced.

  Further, the erroneous light emission preventing mechanism 4E switches between conduction and interruption of the current to the light source 11 by the annular electrode 101 and the internal electrode 102 which are in contact or not in contact with each other according to the inclination of the light emitting unit 2A. . As a result, erroneous light emission of the light source 11 can be reduced by a simple mechanism using the annular electrode 101 and the internal electrode 102.

  Also in the sixth embodiment, the light source 11 does not emit light unless the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, so the original 6 and the heat-sensitive stencil sheet 5 are It is possible to reduce plate-making defects caused by insufficient pressure contact of the light emitting unit 2A to the mounting table 3 via the

  Instead of the universal joint 104, an elastic body such as rubber may be used. Further, a damper may be provided to damp the vibration of the internal electrode 102.

  Alternatively, a sensor that detects the inclination of the light emitting unit 2A may be used to switch between conduction and interruption of the current to the light source 11 according to the inclination of the light emitting unit 2A detected by the sensor.

Seventh Embodiment
Next, a seventh embodiment in which a portion of the first embodiment described above is modified will be described. FIG. 19 is a cross-sectional view showing a schematic configuration of a plate making apparatus according to a seventh embodiment.

  As shown in FIG. 19, a plate-making apparatus 1F according to the seventh embodiment has a configuration in which the erroneous light emission preventing mechanism 4 is replaced with the erroneous light emission preventing mechanism 4F in the plate-making apparatus 1 of the first embodiment described above.

  The erroneous light emission prevention mechanism 4F includes a light / dark determination circuit 111 and a window 112 formed in the housing 13.

  The light / dark judging circuit 111 judges light / dark in the housing 13 and switches conduction / cutoff of the current to the light source 11 based on the judgment result. The light and dark judgment circuit 111 is disposed at a position facing the window 112 in the housing 13.

  The light / dark judging circuit 111 has a light receiving element for receiving light, judges as “bright” when the light receiving amount of the light receiving element is equal to or more than the threshold, and judges as “dark” when the light receiving amount of the light receiving element is less than the threshold. Do. The light / dark judging circuit 111 cuts off the current to the light source 11 when it is judged as "bright", and conducts the current to the light source 11 when it is judged as "dark".

  The window portion 112 is for entering light into the housing 13 from the outside. The window portion 112 is formed at a predetermined position on the bottom surface of the housing 13.

  In the normal mounting state of the light emitting unit 2 in the plate making apparatus 1F of the seventh embodiment, the window portion 112 is covered by the mounting table 3 via the document 6 and the heat-sensitive stencil sheet 5, and the light receiving element The amount of light received is less than the threshold.

  As shown in FIG. 20, when the light emitting unit 2 is mounted on the mounting table 3 in a normal mounting state with respect to the mounting table 3, the light and dark judgment circuit 111 judges as “dark” and the current to the light source 11 is Make it conductive. Thereby, the light source 11 emits light.

  As described above, in the seventh embodiment, the light / dark judging circuit 111 judges the light / dark within the housing 13 in the vicinity of the window portion 112, and cuts off the current to the light source 11 when judged as “bright”. If it is determined to be "dark", the light source 11 is made to conduct current. Accordingly, when the light emitting unit 2 is not in the normal mounting state, the current to the light source 11 is cut off by the light and dark judgment circuit 111, and the light source 11 does not emit light. That is, erroneous light emission of the light source 11 is prevented. Thus, erroneous light emission of the light source 11 can be reduced by a simple configuration using the contrast determination circuit 111 that determines the contrast within the housing 13.

  Also in the seventh embodiment, the light source 11 does not emit light unless the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state. Therefore, as in the first embodiment, the document 6 and the heat sensitive stencil sheet 5 It is possible to reduce plate-making defects due to insufficient pressure contact of the light emitting unit 2 to the mounting table 3 via the

  The window part 112 may be omitted, and the light and dark judgment circuit 111 may be disposed at a position facing the window part (not shown) for transmitting the light of the light source 11.

Eighth Embodiment
Next, an eighth embodiment in which a portion of the sixth embodiment described above is modified will be described. FIG. 21 is a cross-sectional view showing a schematic configuration of the plate making apparatus according to the eighth embodiment.

  As shown in FIG. 21, a plate-making apparatus 1G according to the eighth embodiment has a configuration in which the erroneous light emission preventing mechanism 4E is replaced with an erroneous light emission preventing mechanism 4G in the plate-making apparatus 1E of the sixth embodiment described above.

  The erroneous light emission preventing mechanism 4G has a configuration in which a contact pair 113 is added to the erroneous light emission preventing mechanism 4F of the seventh embodiment described above. Further, in the erroneous light emission preventing mechanism 4G, the window portion 112 is formed at a predetermined position on the bottom surface of the lower cover 41 of the housing 13A.

  The contact point pair 113 is a contact point pair that switches between conduction and interruption of the current to the light source 11 according to the pressure from above on the light emitting unit 2A. The contact pair 113 consists of a pair of contacts 116 and 117. The contacts 116 and 117 are electrically connected to each other via the light / dark determination circuit 111, the light source 11, and the power supply 12.

  The contact point 116 is supported by a support portion 118 provided on the lower cover 41. The contact point 117 is spaced above the contact point 116. The contact point 117 is supported by a support portion 119 provided on the upper cover 42. The contact point 117 moves up and down together with the upper cover 42 in accordance with the pressure from above on the light emitting unit 2A. As a result, the contacts 116 and 117 come in contact with and separate from each other in accordance with the pressing force from above to the light emitting unit 2A.

  In the normal mounting state of the light emitting unit 2A in the plate making apparatus 1G of the eighth embodiment, the window portion 112 is covered by the mounting table 3 with the document 6 and the heat-sensitive stencil sheet 5 in the same manner as in the seventh embodiment. The light reception amount of the light receiving element of the light and dark judgment circuit 111 is less than the threshold value.

  As shown in FIG. 22, when the light emitting unit 2A is mounted on the mounting table 3 in a normal mounting state, the light and dark judgment circuit 111 judges “dark”. However, when no pressure is applied to the light emitting portion 2A from above, the contacts 116 and 117 are separated from each other as shown in FIG. For this reason, the light source 11 does not emit light.

  With the light emitting unit 2A mounted on the mounting table 3 in a normal mounting state, the user applies a pressing force to the light emitting unit 2A from above, and as shown in FIG. 23, the contacts 116 and 117 contact each other Then, a current is supplied to the light source 11, and the light source 11 emits light.

  As described above, the erroneous light emission prevention mechanism 4G of the eighth embodiment includes the contact pair 113 that switches between conduction and interruption of the current to the light source 11 according to the pressure from above on the light emitting unit 2A. As a result, even in a normal mounting state where the light emitting unit 2A determines that the light / dark determination circuit 111 determines “dark”, the light source 11 does not emit light unless a pressing force is applied to the light emitting unit 2A. It can reduce more.

  In addition, it is possible to further reduce plate making defects due to insufficient pressure contact of the light emitting unit 2A with the original 6 and the heat sensitive stencil sheet 5 to the mounting table 3.

  Also in the eighth embodiment, as in the seventh embodiment, the window part 112 is omitted, and the light and dark judgment circuit 111 is disposed at a position facing the window part (not shown) which transmits the light of the light source 11. May be

  The present invention is not limited to the above embodiment as it is, and at the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of components disclosed in the above-described embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components in different embodiments may be combined as appropriate.

[Supplementary note]
The present application discloses the following invention.

(Supplementary Note 1)
A light emitting unit having a light source,
A mounting table on which the light emitting unit is mounted;
And a false light emission preventing mechanism for preventing false light emission of the light source according to the mounting state of the light emitting unit on the mounting table.

(Supplementary Note 2)
The false light emission prevention mechanism is
A contact pair disposed in the light emitting unit and switching between conduction and interruption of current to the light source;
A mounting table side magnet attached to the mounting table;
A light emitting unit side magnet attached to one of the contact points of the contact pair and repelling the mounting base magnet;
When the mounting state of the light emitting unit with respect to the mounting table is in a position where the light emitting unit side magnet and the mounting table side magnet face each other, repulsion between the light emitting unit side magnet and the mounting table side magnet The light emitting device according to claim 1, wherein the light source emits light when one of the contacts of the contact pair comes into contact with the other contact by force.

(Supplementary Note 3)
The false light emission prevention mechanism is
The pressure detection contact pair according to claim 2, further comprising: a pressure detection contact pair which is a pair of two contacts that switches conduction and disconnection of the current to the light source by mutually contacting and separating according to a pressing force on the light emitting unit. Light emitting device.

(Supplementary Note 4)
The light emitting unit is
Lower cover,
It has an upper cover which can be raised and lowered relative to the lower cover according to the pressing force,
The false light emission prevention mechanism is
A contact pair which is a pair of two contacts that switches conduction and disconnection of current to the light source by bringing them into contact with each other according to the elevation of the upper cover;
A stopper that switches between a state in which the upper cover can be lowered to a position where both contacts of the contact pair contact each other, and a state in which the upper cover can not lower to a position where both contacts of the contact pair contact each other ,
A mounting table side magnet attached to the mounting table;
The lock is installed in the light emitting unit, and the stopper is placed in a locked state in which the upper cover can not be lowered to a position where both contacts of the contact pair come in contact with each other due to a repulsive force between the light emitting unit and the mount base magnet. The light emitting device according to claim 1, further comprising: a light emitting unit side magnet switching to a lock released state in which the upper cover can be lowered to a position where both contacts of the contact pair are in contact with each other.

(Supplementary Note 5)
The light emitting device according to claim 1, wherein the erroneous light emission preventing mechanism switches between conduction and interruption of current to the light source according to an inclination of the light emitting unit.

(Supplementary Note 6)
The false light emission prevention mechanism is
An annular electrode fixed to the light emitting portion;
A rod-shaped internal electrode suspended on the inside of a ring formed by the annular electrode and installed in the light emitting unit so as to maintain a vertical posture regardless of the inclination of the light emitting unit;
When the internal electrode is not in contact with the annular electrode, conduction of current to the light source is enabled, and when the internal electrode is in contact with the annular electrode due to the light emitting portion being inclined, the current to the light source is interrupted. The light emitting device according to appendix 5, comprising: a switching unit.

1, 1A, 1B, 1C, 1D, 1F, 1G plate making apparatus 2, 2A light emitting unit 3 mounting table 4, 4A, 4B, 4C, 4D, 4E, 4F, 4G false emission prevention mechanism 11 light source 12 power supply 13, DESCRIPTION OF SYMBOLS 13A Housing | casing 16, 16A, 16B Contact pair 17, 17A, 17B The light emission part side magnet 18 Mounting base side magnet 21,21A, 21B, 22, 22A, 22B Contact 31 Contact point pair 32 Light emission part side magnet 33 Mounting base side magnet 36 , 37 contacts 41 lower cover 42 upper covers 46, 46A, 46B, 47, 47A, 47B contact pairs 51, 51A, 51B, 52, 52A, 52B contacts 58, 58A, 58B, 59, 59A, 59B contacts 66, 67 contacts 71, 72, 75, 76 contact point 81 contact point pair 82 stopper 83 light emitting unit side magnet 86, 87 contact point 93 contact point pair 94 inclination detecting portion 96, 7 contacts 101 ring electrodes 102 internal electrode 103 switching circuit 111 brightness determination circuit 112 window 113 contact pairs 116 and 117 contacts

Claims (6)

A light emitting unit having a light source,
A mounting table on which the light emitting unit is mounted;
And a false light emission preventing mechanism for preventing false light emission of the light source according to the mounting state of the light emitting unit on the mounting table. The false light emission prevention mechanism is
A contact pair disposed in the light emitting unit and switching between conduction and interruption of current to the light source;
A mounting table side magnet attached to the mounting table;
A light emitting unit side magnet attached to one of the contact points of the contact pair and repelling the mounting base magnet;
When the mounting state of the light emitting unit with respect to the mounting table is in a position where the light emitting unit side magnet and the mounting table side magnet face each other, repulsion between the light emitting unit side magnet and the mounting table side magnet The light emitting device according to claim 1, wherein the light source emits light when one of the contacts of the contact pair comes into contact with the other contact by force. The false light emission prevention mechanism is
The pressure detection contact pair according to claim 2, further comprising: a pressure detection contact pair which is a pair of two contact points for switching on / off of the current to the light source by coming in and out of contact with each other according to a pressing force on the light emitting portion. Light emitting device. The light emitting unit is
Lower cover,
It has an upper cover which can be raised and lowered relative to the lower cover according to the pressing force,
The false light emission prevention mechanism is
A contact pair which is a pair of two contacts that switches conduction and disconnection of current to the light source by bringing them into contact with each other according to the elevation of the upper cover;
A stopper that switches between a state in which the upper cover can be lowered to a position where both contacts of the contact pair contact each other, and a state in which the upper cover can not lower to a position where both contacts of the contact pair contact each other ,
A mounting table side magnet attached to the mounting table;
The lock is installed in the light emitting unit, and the stopper is placed in a locked state in which the upper cover can not be lowered to a position where both contacts of the contact pair come in contact with each other due to a repulsive force between the light emitting unit and the mount base magnet. The light emitting unit side magnet which switches to the unlocking state which enables the upper cover to be lowered to the position where both contacts of the contact pair come in contact with each other, and the light emitting device according to claim 1.   The light emitting device according to claim 1, wherein the erroneous light emission preventing mechanism switches between conduction and interruption of current to the light source in accordance with an inclination of the light emitting unit. The false light emission prevention mechanism is
An annular electrode fixed to the light emitting portion;
A rod-shaped internal electrode suspended on the inside of a ring formed by the annular electrode and installed in the light emitting unit so as to maintain a vertical posture regardless of the inclination of the light emitting unit;
When the internal electrode is not in contact with the annular electrode, conduction of current to the light source is enabled, and when the internal electrode is in contact with the annular electrode due to the light emitting portion being inclined, the current to the light source is interrupted. The light emitting device according to claim 5, comprising: a switching unit.