Transmitter

Abstract

To provide a transmitter capable of giving click feeling to an operator and making the operator know that a push button has been completely pushed.SOLUTION: A transmitter includes: a transmitter body including a housing case having an opening in a front portion thereof and a built-in switch; and a front panel unit having a first protection plate (a push button). The housing case includes: a second protection plate (a slide member) configured to be moved by pushing operation of the first protection plate; a latch member swingably disposed at a position facing a protrusion part provided on the second protection plate; and a spring member for energizing the latch member. The latch member has formed therein unevenness on which the protrusion can slide. The projection is engaged with a recess of the latch member in a normal state. It is configured that when the first protection plate is depressed, the projection climbs over a convex of the latch member, and thereby the latch member reciprocates and rotates.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a transmitter for emergency notification, and more particularly to a technology effective for use in a fire notification transmitter provided on a wall of a building and operated at the time of a fire to issue an alarm.

Background Art

[0002] A fire notification system is provided inside a building to notify of the occurrence of a fire. The fire notification system includes a fire detector, a manual fire notification transmitter equipped with a push button switch, a receiver, a fire notification bell, an indicator light, etc. Among these, the fire notification transmitter is installed on the wall surface of a corridor or the like in the building at an appropriate height. At the time of a fire, when the discoverer strongly presses the push button of the fire notification transmitter, the built-in switch is turned on, and a signal notifying of the occurrence of the fire is transmitted to the receiver, and an alarm sound is emitted from a bell provided near the transmitter, thereby notifying the people around of the occurrence of the fire.

[0003] Conventional fire notification transmitters generally have a disk-shaped front panel portion that covers the indoor exposed portion on the front of the transmitter body. The transmitter body includes a push button (protective plate) for turning on the built-in switch and a telephone jack for connecting a transceiver for communicating with a monitor of the fire receiver. When it is pushed in to a predetermined depth sufficient to turn on the built-in switch, it has a latch structure that holds the pushed-in state. Therefore, when the push button is pushed in, there is an advantage that a clicking feeling is given to the operator by the latch structure and it can be seen that it is in an on state also visually.

[0004] On the other hand, in recent years, flat-type indicator lights having a flat or disk-shaped front surface or fire notification transmitters in which the indicator light is integrally formed have been put into practical use. By configuring the indicator light integrally with the transmitter, there is an advantage that the indicator light provided separately from the transmitter becomes unnecessary. Furthermore, an invention relating to a fire alarm transmitter equipped with a telephone jack, an integrated indicator light, and a latch structure that maintains a pressed-in state is described in, for example, Patent Document 1. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-152944 [Overview of the project] [Problems that the invention aims to solve]

[0006] The fire alarm transmitter described in Patent Document 1 has an opening / closing door on the front panel of the transmitter that covers the front of the telephone jack, so that the boundaries between the indicator light, push button, and opening / closing door on the front are clearly visible. On the other hand, in recent years there has been a growing demand for aesthetically pleasing interior design of buildings, and transmitters with clearly visible boundaries between each component have the problem of not harmonizing with the interior and creating an incongruity when installed on the interior wall of a building.

[0007] Therefore, the applicant has devised a transmitter that ensures the ability to use the telephone jack from the front of the transmitter, while reducing the boundaries between parts to harmonize with the interior of the building and minimize any sense of incongruity, and has previously filed an application for this (Japanese Patent Application No. 2021-174656). However, unlike conventional transmitters, the transmitter described in the prior application does not have a latch structure to hold the push button in the pressed position. Therefore, it employs a latch circuit to electrically latch and illuminate the lamp. Consequently, while conventional transmitters had the advantage of a strong click sensation when the protective plate latched, and it was also visually clear that the button was pressed, the transmitter described in the prior application does not have a latch structure, resulting in the problem that there is no click sensation and it is difficult to tell when the button has been fully pressed.

[0008] The present invention relates to an improvement on the above-mentioned prior invention, and its objective is to provide a transmitter that can provide the operator with a click sensation and let the operator know when the push button has been fully pressed. [Means for solving the problem]

[0009] To solve the above problems, the present invention provides A transmitter comprising a transmitter body that is mounted on a mounting surface and has a storage case with an opening at the front and a built-in on / off switch, and a front panel having a first protective plate that operates the switch, The storage case is provided with a second protective plate which is moved by a pressing operation of the first protective plate, a latch member which is pivotably disposed at a position opposite to a projection provided on the second protective plate, and a spring member which biases the latch member toward the projection. The portion of the latch member facing the projection has irregularities formed on it that allow the projection to slide against it. Under normal conditions, the projection engages with the recess of the latch member, and when the first protective plate is pressed, the projection overcomes the protrusion of the latch member, causing the latch member, which is biased toward the projection by the spring member, to reciprocate and rotate.

[0010] With the above configuration, in a transmitter equipped with a first protective plate (push button) that activates a built-in switch, when the push button is pressed, the projection overcomes the protrusion of the latch member, causing the latch member to reciprocate and rotate. As a result, the vibration generated when the latch member reciprocates is transmitted to the push button, providing a click sensation to the operator's finger and letting the operator know that the push button has been fully pressed.

[0011] Preferably, a compression spring is provided inside the storage case so as to be located on the back of the second protective plate, and when the pushing operation of the first protective plate is stopped, the second protective plate and the first protective plate are returned to their original positions by the restoring force of the compression spring. With this configuration, even if the first protective plate (push button) is pressed, the second protective plate and the first protective plate do not remain in a pressed-down locked state, thus eliminating the need for an operation to unlock.

[0012] Preferably, the protrusion of the latch member has a V-shape with a first inclined surface located on the front side in the direction of movement when the second protective plate is pressed and a second inclined surface located on the forward side in the direction of movement when pressed, and is configured such that the angle made by the first inclined surface with respect to a plane perpendicular to the direction of movement when pressed and the angle made by the second inclined surface are different. With the configuration described above, it becomes possible to optimally set both the pressing force of the first protective plate (push button) and the click sensation applied to the first protective plate.

[0013] Furthermore, preferably, the angle formed by the second inclined surface of the latch member is smaller than the angle formed by the first inclined surface. With this configuration, the pressing force (resistance) of the first protective plate (push button) can be reduced while increasing the click sensation applied to the first protective plate.

[0014] Furthermore, preferably, the first protective plate is incorporated into the front panel portion, while the second protective plate is incorporated into the transmitter body portion, and the first protective plate is configured to separate from the second protective plate when the front panel portion is moved in the opening direction. With this configuration, even when the front panel is open, a second protective plate is present in front of the internal switch, allowing the internal switch to be turned on without directly touching it by pressing the second protective plate. [Effects of the Invention]

[0015] According to the present invention, in a transmitter equipped with a first protective plate (push button) that activates a built-in switch, the effect is to provide the operator with a click sensation, allowing the operator to know when the push button has been fully pressed. [Brief explanation of the drawing]

[0016] [Figure 1] There is an overall perspective view showing an embodiment of the transmitter according to the present invention. [Figure 2] It is a central cross-sectional side view showing the internal structure of the transmitter of the embodiment. [Figure 3] It is an enlarged cross-sectional view of a main part showing details of the structure of the front panel constituting the transmitter of the embodiment. [Figure 4] (A) and (B) are cross-sectional side views showing the procedure of the opening operation of the front panel of the transmitter of the embodiment. [Figure 5] It shows the state change when the push button of the transmitter of the embodiment is being pushed. (A) is an enlarged cross-sectional view of the main part showing the state during pushing, and (B) is an enlarged cross-sectional view of the main part showing the state where the push button is fully pushed in. [Figure 6] (A) is an enlarged view showing the detailed shape of the latch member provided inside the transmitter of the embodiment, and (B) is an enlarged view showing the angle of the convex part of the latch member.

Mode for Carrying Out the Invention

[0017] Hereinafter, an embodiment of a fire alarm transmitter to which the present invention is applied will be described with reference to the drawings. The fire alarm transmitter of the present invention (hereinafter simply referred to as a transmitter) has a function of transmitting a signal notifying the occurrence of an abnormality to a fire receiver by strongly pressing a push button provided on the front to turn on an internal switch when an abnormality such as a fire occurs, and is configured to be installed and used on a building wall or a door of a fire hydrant box.

[0018] FIG. 1 shows an embodiment of the transmitter according to the present invention. Among these, FIG. 1 is an overall perspective view of the transmitter, FIG. 2 is a cross-sectional side view showing the internal structure of the transmitter shown in FIG. 1, and FIG. 3 is an enlarged cross-sectional structure view of a part (light emitting part) of the transmitter shown in FIG. 1. As shown in Figure 1, the transmitter of this embodiment consists of a transmitter body 10 equipped with a box-shaped storage case 13 containing a push-button switch, and a disc-shaped front panel 20 provided at the front of the transmitter body 10, equipped with a push button 21 serving as a first protective plate in the center of the front.

[0019] As shown in Figure 2, the transmitter unit 10 includes a box-shaped storage case 13 that houses a push-button switch 11 and a telephone jack 12 into which the plug at the end of the handset cord is inserted. The storage case 13 has an opening on the side of the push button 21 (left side in the figure) and is provided with a spring receiving member 16 at the back (right side in the figure) for housing multiple (for example, four) compression springs 15. A sliding member 17, which is a second protective plate that forms a circle when viewed from the front, is provided to cover the front side of the compression springs 15 housed in each spring storage recess of the spring receiving member 16.

[0020] A boss portion 17a is formed in the center of the slide member 17, projecting toward the rear (to the right in the figure), and a guide cylinder portion 16a into which the boss portion 17a can be fitted is formed in the center of the front side of the spring receiving member 16, so that the slide member 17 can move in the front-rear direction guided by the guide cylinder portion 16a. Furthermore, a push-button type switch 11 is positioned in the center of the guide cylinder portion 16a so that the actuator faces the end face of the boss portion 17a. Furthermore, an annular flange portion 13a is formed at the front end of the storage case 13, which is joined to the back of the front panel portion 20.

[0021] On the other hand, the front panel section 20 has a circular push button 21 made of a non-transparent material in the center of the front, and a ring-shaped light-emitting section 22 is provided around it, with a dish-shaped support plate 23 on the back side of the light-emitting section 22. A guide cylinder section 23a is formed in the center of this support plate 23, and a pressing rod section 21a is fitted into this guide cylinder section 23a so as to protrude backward (to the right in the figure) from the center of the back of the circular push button 21. Although not shown, the push button 21 is configured not to move forward (to the left in the figure) beyond a predetermined distance.

[0022] Furthermore, the pressing rod portion 21a penetrates the guide cylinder portion 23a and protrudes toward the storage case 13, and its protruding end is configured to abut against the center of the front of the slide member 17 inside the storage case 13 of the transmitter body portion 10. When the push button 21 is pressed from front to rear, the push button 21 is moved backward against the spring force of the compression spring 15 inside the transmitter body portion 10, and the pressing rod portion 21a on the back abuts against the actuator portion of the push button type switch 11, pressing it and turning the switch 11 into the ON state.

[0023] Furthermore, the light-emitting section 22 of the front panel section 20 is formed of a light-transmitting light-guide material such as acrylic resin or polycarbonate resin, and is configured to provide light illumination by guiding light from the light-emitting LEDs arranged inside the front panel section 20 and emitting it to the front. Furthermore, an LED substrate 27 is installed around the guide cylinder portion 23a on the front surface of the support plate 23, and a plurality of light-emitting elements (LEDs) 28 are arranged on this LED substrate 27 in a line along the circumferential direction at predetermined intervals. The light emitted forward from the light-emitting elements 28 is guided to the annular light-emitting portion 22 of the front panel portion 20, and is emitted from the front surface of the light-emitting portion 22 while repeatedly reflecting, so that the entire structure lights up brightly.

[0024] The light-emitting element 28 is, for example, red, similar to conventional indicator lights. Instead of using a red light-emitting element, a white light-emitting element may be used, and a light guide material colored red may be used to form the light-emitting section 22. Furthermore, the push button 21 and the light-emitting section 22 are formed from a light guide material such as glass or a light-transmitting resin such as acrylic resin, and this light guide material may contain particulate diffusing material.

[0025] Furthermore, the light-emitting portion 22 that constitutes the front panel portion 20 has a mortar-shaped inclined portion on the inside and a flat portion on the outside, and as shown in Figure 3, it is composed of a light guide member 22A with a light introduction portion 22c formed at the end of the inclined portion facing the plurality of light-emitting elements 28 on the LED substrate 27, and a light-transmitting cover member 22B that covers the surface of the light guide member 22A. The light guide member 22A is joined to the front surface of the flat portion of the support plate 23. Furthermore, the push button 21 is provided with a flange portion 21b, and this flange portion 21b extends to the light introduction portion 22c of the light guide member 22A, i.e., to the front position of the light-emitting element 28.

[0026] In the transmitter of this embodiment, light incident from the light introduction portion 22c on the inner end face of the light guide member 22A is guided to the flat portion by the inclined portion, strikes the surface and changes direction, a portion of which is emitted towards the surface side, while the remainder is repeatedly reflected between the surface and back surface and guided towards the outer edge. Furthermore, canopy portions 22b and 23b are provided on the outer edges of the light guide member 22A and the support plate 23. As a result, some of the light guided by the main body of the light guide member 22A is emitted laterally from the canopy portion 22b, making it easier to see the illuminated display on the front panel portion 20 from a distance to the side of the transmitter.

[0027] On the other hand, the cover member 22B is composed of a shape-retaining member made of a translucent, shape-retaining soft material such as silicone resin, and a light-diffusing film made of a flexible material such as a synthetic resin sheet or cloth that is provided to cover the surface of the shape-retaining member. The cover member 22B is formed to cover the eaves portion 22b of the outer edge of the light guide member 22A from the side to the back. As a result, even if the cover member 22B is subjected to an external impact, the shape-retaining member deforms to absorb the impact and prevent surface damage. Furthermore, because the surface of the shape-retaining member is covered with a light-diffusing film, the light guided by the light guide member 22A is diffused and emitted forward, giving it a soft, hazy texture. In addition, because the surface side of the front panel 20 is curved, the design is improved, and it harmonizes with the interior of the building where the transmitter is installed, making it less likely to look out of place.

[0028] Furthermore, the transmitter of this embodiment has the advantage that the light-emitting section 22 functions as an indicator light to show the position of the transmitter, and because the front surface of the light-emitting section 22 is a nearly flat curved shape, it does not protrude forward as much as conventional bullet-shaped indicator lights, and does not become an obstacle when transporting equipment. Furthermore, although the push button 21 is made of a non-transparent material, the front side of the light guide member 22A of the light-emitting section 22 is curved and slopes downward toward the opening near the central opening. As a result, some of the light emitted (scattered) from this sloped section reaches the surface of the push button 21 and brightens it. This reduces the difference in brightness between the surface of the push button 21 and the surface of the light-emitting section 22. Therefore, even though the push button 21 is made of a non-transparent material, it is possible to make the push button 21 less conspicuous and create a transmitter that harmonizes with the surrounding interior and does not look out of place.

[0029] Furthermore, in the transmitter of this embodiment, as shown in Figure 4, a ring member 24 is fitted to the back side of the support plate 23 that constitutes the front panel portion 20, and a flange 24a extending vertically is provided at the lower part of this ring member 24. A pin hole is formed in this flange 24a, and one end of a slide plate 26, which protrudes rearward from the lower back of the support plate 23 and slides along the inner surface of the bottom wall of the storage case 13, is connected by a pin 25 inserted into this pin hole. On the other hand, a rib-shaped guide rail 13c is provided on the lower inner surface of the side wall of the storage case 13, parallel to the bottom wall 13b. The side end of the slide plate 26 engages with the groove formed by the guide rail 13c and the bottom wall 13b of the storage case 13, thereby supporting it so that it can move forward while maintaining a horizontal position. Furthermore, as shown in Figure 4(B), the front panel portion 20 is configured to be rotatable so that its upper part tilts forward around the pin 25.

[0030] With the configuration described above, the transmitter of this embodiment allows for communication by opening the front panel 20 to expose the telephone jack 12 and inserting the plug at the end of the handset cord. Although not shown, the guide rail 13c is provided with a retaining structure to prevent the slide plate 26 from coming out forward. Alternatively, instead of the slide plate 26 and the guide rail 13c, a link mechanism that allows the front panel 20 to move diagonally downward may be provided.

[0031] As described above, the transmitter of this embodiment is configured such that the front panel 20 is moved forward and then rotated downward to expose the telephone jack 12. Therefore, there is no need to provide an opening / closing door on the front panel 20 to cover the front of the telephone jack 12, resulting in fewer front components and fewer boundaries between components, making the boundaries less noticeable. In addition, the entire front surface of the light-emitting section 22 becomes a light-emitting surface and emits light, and a portion of the light is directed onto the front of the push button 21, making the boundary between the push button 21 and the light-emitting section 22 less noticeable. Therefore, it can be harmonized with the interior of the building, reducing the likelihood of incongruity and improving aesthetics. Furthermore, since there is no need for an opening and closing door for the telephone jack 12, even if the transmitter is miniaturized, the light-emitting section 22 can be made relatively larger, avoiding a decrease in visibility due to a smaller illuminated display area. In addition, because there is no opening and closing door, the push button 21 can be made relatively larger, improving operability.

[0032] Furthermore, the transmitter can be attached to a wall or mounting panel as an installation surface by, for example, forming an opening in the wall or mounting panel into which the storage case 13 can be inserted, providing screw holes around the opening, inserting the storage case 13 into this opening and joining the flange portion 13a to the wall or mounting panel, and then screwing the screws into the screw holes in the flange portion 13a and the screw holes around the opening of the mounting panel. Alternatively, a male threaded portion may be formed on the outer circumference of the opening-side end of the storage case 13, a ring-shaped nut may be screwed onto this male threaded portion, and the mounting panel may be sandwiched between the ring-shaped nut and the flange portion 13a for attachment.

[0033] Next, using Figure 5, we will explain the structure and operation of the push button 21 of the transmitter that provides a click sensation. Figure 5(A) shows the state in which the push button 21 is being pressed, and (B) shows the state in which the push button 21 is pressed all the way in. As shown in Figure 5, the transmitter of this embodiment is provided with a projection 17b on the upper part of the slide member 17 that protrudes upward and has a rounded head. Opposite to this projection 17b, the upper part of the storage case 13 is provided with a latch mechanism consisting of a latch member 18 positioned in a nearly horizontal position and a compression spring (latch spring) 19 for biasing the latch member 18 toward the projection 17b of the slide member 17.

[0034] As shown in an enlarged view in Figure 6(A), the latch member 18 has an inverted V-shaped groove 18a and a downward-facing protrusion 18b continuously formed on its lower surface in the front-rear direction. The protrusion 18b of the latch member 18 has a mountain shape with a first inclined surface located on the front side in the direction of movement when the slide member 17 is pressed and a second inclined surface located on the forward side in the direction of movement when pressed, and is formed such that the angle θ of the first inclined surface and the angle θ' of the second inclined surface are different with respect to a plane perpendicular to the direction of movement when pressed. Specifically, the angle θ' of the second inclined surface of the latch member 18 is smaller than the angle θ of the first inclined surface. The larger the angle θ of the first inclined surface, the smaller the pressing force (resistance force) of the push button 21 can be, and the smaller the angle θ, the larger the pressing force (resistance force), but the greater the click sensation. However, the larger θ is, the greater the amount of movement. On the other hand, the smaller the angle θ' formed by the second inclined surface, the greater the click sensation applied to the push button 21. However, the smaller θ' is, the worse the return of the sliding member 17 and the push button 21 becomes. Therefore, it is best to set θ and θ' while considering the above advantages and disadvantages.

[0035] Furthermore, the latch member 18 is formed in a semi-cylindrical shape with a rounded end on the rear side (right side in the figure), and the front end (left side in the figure) is arranged to swing vertically using this as a pivot point. In addition, a storage section 13d for housing the compression spring (latch spring) 19 is formed on the inner surface of the upper wall of the storage case 13, and a semi-cylindrical recess 16b for housing the pivot point of the latch member 18 is formed in the spring receiving member 16. Furthermore, a ring member 24, which is fitted to the back side of the support plate 23 that constitutes the front panel portion 20, is located in front of the latch member 18.

[0036] Next, the operation of the latch mechanism described above will be explained. When a finger is placed on the front of the push button 21 on the front panel 20 and the push button 21 is pushed backward, the rear end surface of the pressing rod 21a moves the slide member 17 backward. Then, as shown in Figure 5(A), the tip of the projection 17b on the upper part of the slide member 17 rides up onto the convex part 18b of the latch member 18, causing the latch member 18 to rotate upward. At this time, the compression spring 15 on the back of the slide member 17 and the compression spring 19 above the latch member 18 become compressed.

[0037] Then, when the push button 21 is pushed further backward, as shown in Figure 5(B), the tip of the projection 17b on the upper part of the slide member 17 passes over the protrusion 18b of the latch member 18, and the latch member 18 rotates downward due to the restoring force of the compression spring 19. Meanwhile, the compression spring 15 on the back of the slide member 17 is further compressed. During the above series of operations, vibrations are transmitted from the slide member 17 to the push button 21, giving the operator a click sensation at their fingertips. Furthermore, when the push button 21 is fully pressed, the back of the sliding member 17 comes into contact with the actuator of the push-button switch 11, turning the switch on. This then causes the transmitter to send a signal to activate the alarm.

[0038] Subsequently, when the finger is released from the front of the push button 21, the push button 21 moves forward due to the spring force of the compression spring 15 on the back of the slide member 17 in the reverse direction of the above operation. As it moves, the latch member 18 is rotated upward and the compression spring 19 is compressed. Then, when the tip of the projection 17b on the upper part of the slide member 17 passes over the protrusion 18b of the latch member 18, it is rotated downward by the spring force of the compression spring 19, returning to its original state where the tip of the projection 17b on the upper part of the slide member 17 is engaged with the groove 18a of the latch member 18.

[0039] Although the present invention has been described above based on embodiments, the present invention is not limited to those embodiments described above. For example, in the above embodiment, the push button 21 was described as being made of a non-transparent material, but the push button 21 and the slide member 17 may also be made of a translucent material so that light is emitted from the front of the push button 21 together with the front panel 20, and the entire front surface of the transmitter lights up. Furthermore, a light-emitting element (LED) may be installed near the switch 11 so that when the internal switch is turned on by pressing the push button 21, the light-emitting element emits light, which passes through the inside of the slide member 17 and the push button 21, illuminating the surface of the push button 21 and indicating that the operation has been confirmed. Furthermore, in the above embodiment, multiple small-diameter compression springs 15 are arranged on the back of the slide member 17, but it is also possible to arrange a single large-diameter compression spring 15.

[0040] Furthermore, in the above embodiment, when the finger is released from the front of the push button 21, the spring force of the compression spring 15 on the back of the slide member 17 causes the push button 21 to move forward and return to its original state. However, a locking mechanism may be provided to hold the slide member 17 in the pressed-down state. Furthermore, although the above embodiment described the application of the present invention to a fire alarm transmitter that constitutes a fire alarm system, the present invention is not limited to fire alarm transmitters and can be widely used for transmitters for emergency train stops installed on station platforms and level crossings. [Explanation of symbols]

[0041] 10 Transmitter main unit 11 Push-button switch 12. Phone jacking 13 Storage Cases 15 Compression spring 16 Spring support member 17. Sliding member (second protective plate) 18 Latch member 18a groove 18b Convex part 19 Compression spring 20 Front panel section 21 Push button (first protective plate) 22 Light emitting part 22A Light guide member 22B Cover component 23 Support plate 24 Ring Member 25 pins 26 Slide Plate 27 LED boards 28 Light-emitting elements

Claims

1. A transmitter comprising: a transmitter body that is mounted on a mounting surface and has a storage case with an opening at the front and a built-in on / off switch; and a front panel that has a first protective plate for operating the switch, The storage case is provided with a second protective plate which is moved by a pushing operation of the first protective plate, a latch member which is pivotably disposed at a position opposite to a projection provided on the second protective plate, and a spring member which biases the latch member toward the projection. A transmitter characterized in that the portion of the latch member facing the projection has irregularities formed on it that allow the projection to slide against it, the projection engages with the recess of the latch member under normal conditions, and when the first protective plate is pressed, the projection overcomes the protrusion of the latch member, causing the latch member, which is biased toward the projection by the spring member, to reciprocate and rotate.

2. The transmitter according to claim 1, characterized in that a compression spring is disposed inside the storage case so as to be located on the back of the second protective plate, and when the pushing operation of the first protective plate is stopped, the second protective plate and the first protective plate return to their original positions by the restoring force of the compression spring.

3. The transmitter according to claim 1 or 2, characterized in that the protrusion of the latch member has a mountain shape having a first inclined surface located on the front side in the direction of movement when the second protective plate is pressed and a second inclined surface located on the forward side in the direction of movement when pressed, and the angle made between the first inclined surface and the second inclined surface with respect to a plane perpendicular to the direction of movement when pressed is different.

4. The transmitter according to claim 3, characterized in that the angle formed by the second inclined surface of the latch member is smaller than the angle formed by the first inclined surface.

5. The transmitter according to claim 2, characterized in that the first protective plate is incorporated into the front panel portion, while the second protective plate is incorporated into the transmitter body portion, and the first protective plate is configured to separate from the second protective plate when the front panel portion is moved in the opening direction.

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