JP5761801B2 - control panel - Google Patents

Description

  The present invention relates to an operation panel having a rotatable operation knob that stops at a plurality of selected positions.

  For example, a vehicle is provided with an operation panel that is provided with a rotary operation knob as switching means for adjusting the temperature of the air conditioner and adjusting the air volume. This operation panel is configured by arranging an annular display plate indicating the selection position of the operation knob around the opening of the panel body in which an opening for mounting the operation knob is formed.

  In such an operation panel, an annular display board is conventionally attached to the front surface of the panel body (see, for example, Patent Document 1).

Japanese Patent No. 3779472

  However, if a configuration in which an annular display plate is attached to the front surface of the panel main body as in the prior art, an edge (parting line) of the display plate appears, resulting in a decrease in the appearance of the operation panel. There was a problem.

  As one of the methods for solving the above problem, there is a method in which a display plate is subjected to drawing processing so that a parting line cannot be seen, and a peripheral portion of the display plate is bent to the back side to form a bent portion. When the bent part of the plate is fixed to the panel body by sticking, it is difficult to assemble the display board because the assembling direction and the sticking surface are parallel, and only the annular display part of the display board is the panel. There is a problem of being fixed to the main body. And if the bent part of the display board is not fixed to the panel body, the end part will be lifted up, and a gap will be created between the bent part of the display board and the panel body, generating abnormal noise or light leakage etc. A problem occurs.

  As another method of fixing the display panel with the peripheral edge drawn to the panel body, there is a method in which the display board and the panel body are integrally formed by insert molding. There is a problem that the mold becomes complicated and the mold cost increases.

  The present invention has been made in view of the above problems, and its object is to provide an operation panel that is inexpensive and attractive.

  In order to achieve the above object, the invention according to claim 1 is characterized in that the selected position is arranged around the opening of the panel body having an opening to which a rotatable operation knob that stops at a plurality of selected positions is mounted. In the operation panel formed by disposing the annular display plate shown, the inner peripheral edge and the outer peripheral edge of the annular display portion of the display plate are bent to the back side to form bent portions, respectively, and the display body Forming a cylindrical holding portion for holding the bent portion of the plate, and forming a plurality of first welding ribs on the inner and outer side walls of the holding portion at predetermined intervals in the circumferential direction, The first welding rib is bonded to the bent portion of the display plate by ultrasonic welding.

  According to a second aspect of the present invention, in the first aspect of the invention, the first welding rib is formed so as to expand toward the side farther from the side closer to the top of the inner cylinder of the holding portion of the panel body. And

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the second welding ribs are provided on the outer peripheral edge and the inner peripheral edge of the cylindrical top surface of the holding portion of the panel body toward the display portion of the display plate. It protrudes and this 2nd welding rib was joined to the back surface of the display part of the said display board by ultrasonic welding.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, a translucent symbol portion is provided in the display portion of the display plate, and a notch portion is provided at a position corresponding to the symbol portion of the second welding rib. It is formed.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein stepped portions are respectively formed on the inner peripheral portion and the outer peripheral portion of the holding portion of the panel body, and the depth length of the stepped portion. Is set to be larger than the depth of the bent portion of the display board.

  According to the first aspect of the present invention, the first welding rib formed in advance on the panel main body and the bent portion of the display plate may be joined by ultrasonic welding. Even if it is a display panel that has a bent part formed by folding the inner and outer edges to the back so that the parting line is not visible, the bent part is securely fixed to the panel body and lifted The operation panel can be obtained at low cost and with good appearance.

  According to the second aspect of the present invention, the side of the first weld rib near the cylindrical top of the holding portion of the panel body enters the gap between the display plate and the panel body, and the side surface of the bent portion of the display plate and the panel body And are welded. Further, the side of the first welding rib that is far from the cylindrical top of the panel main body holding portion is welded to the end surface of the bent portion of the display plate. As described above, since the two surfaces of the bent portion of the display plate are welded to the panel body with one first welding rib, the display plate is more securely fixed to the panel body. And if it is made to weld to a panel main body also by the side surface with the end surface of the bending part of a display board by the 1st welding rib in this way, it will not be influenced by the variation in the shape and dimension of a display board or a panel main body. Can be securely fixed to the panel body. By the way, when the display panel is welded to the panel body only by the end face of the bent portion, the first weld rib of the panel body and the end face of the bent portion of the display board are not in contact with each other, so that both cannot be welded. There is.

  According to the invention of claim 3, since the second welding ribs are joined to the back surface of the display portion of the display plate by ultrasonic welding on the outer peripheral edge and the inner peripheral edge of the cylindrical top portion of the holding portion of the panel body, the display plate Is more firmly fixed to the panel body.

  According to the invention described in claim 4, since the notch is formed at the position corresponding to the symbol part on the display plate side of the second welding rib of the panel body, the second rib is formed by ultrasonic welding in the notch. It does not melt to form a display surface and a welding surface, and the light shielding property of the symbol part of the display plate is not impaired by the welding surface.

  According to the fifth aspect of the present invention, the step portions are respectively formed on the inner peripheral portion and the outer peripheral portion of the holding portion of the panel body, and the depth length of the step portions is larger than the depth length of the bent portion of the display plate. Therefore, the second welding rib always reliably contacts the back surface of the display portion of the display plate and both are ultrasonically welded, and the display portion of the display plate is securely fixed to the panel body.

It is a front view of the operation panel which concerns on this invention. It is a disassembled perspective view of the operation panel which concerns on this invention. It is a front view of the panel main body of the operation panel which concerns on this invention. It is a perspective view of the holding | maintenance part provided in the panel main body of the operation panel which concerns on this invention. It is the A section enlarged detail drawing of FIG. It is the B section enlarged detail drawing of FIG. FIG. 5 is an enlarged detail view of a C part in FIG. 4. It is a partial plane sectional view of the operation panel concerning the present invention. It is a partial plane sectional view which shows the state before joining the display board of the operation panel which concerns on this invention to a panel main body. It is a partial plane sectional view which shows the state after joining the display board of the operation panel which concerns on this invention to the panel main body.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of an operation panel according to the present invention, FIG. 2 is an exploded perspective view of the operation panel, FIG. 3 is a front view of a panel body of the operation panel, and the operation panel 1 shown in FIG. For controlling an air conditioner (not shown), an air blow mode switching switch 2, an air volume adjusting switch 3, and a temperature adjusting switch 4 are arranged in parallel on the front surface from the left. A rear differential switch 5, an air conditioner switch 6, and an inside / outside air changeover switch 7 are juxtaposed in the lateral direction at the center in the width direction at the bottom of the front surface of the operation panel 1. The rear differential switch 5, the air conditioner switch 6, and the inside / outside air changeover switch 7 are push-type square switches. The rear differential switch 5 energizes a heat wire (not shown) stretched on the rear window to transmit the heat wire. The air-conditioner switch 6 is for switching the air-conditioner mode. The inside / outside air changeover switch 7 is used for switching between inside air circulation in the vehicle interior and introduction of outside air into the vehicle interior.

  By the way, in the operation panel 1 shown in FIG. 1, the part exposed to the exterior of the front surface of the resin panel main body 8 shown in FIGS. 2 and 3 (the part excluding the various switches 2 to 7) has an inverted trapezoidal plate shape. A light source (not shown) is disposed on the back side of the operation panel 1.

  The air blowing mode switching switch 2, the air volume adjusting switch 3 and the temperature adjusting switch 4 are dial type round switches, each of which has a rotatable operation knob 10 which stops at a plurality of selected positions. Each of the operation knobs 10 is provided with a long and narrow index portion 11 for indicating the operation position. These indicator parts 11 are comprised with the translucent material, and the operation position of each operation knob 10 is shown by making these transmit the light from the light source not shown to the front side.

  The panel body 8 shown in FIGS. 2 and 3 is integrally formed of a resin such as PCABS, which corresponds to the air blowing mode switching switch 2, the air volume adjusting switch 3, and the temperature adjusting switch 4. Three cylindrical holding portions 8A are integrally formed in the lateral direction. The operation knobs 10 are rotatably attached to the circular openings 8a that open to the center of the holding portions 8A.

  As shown in FIGS. 2 and 3, a rectangular frame-shaped housing 8B that is elongated in the lateral direction is integrally formed in the lower central portion of the panel body 8. The housing 8B includes the rear differential switch 5, the air conditioner, and the like. Rectangular holes 8b, 8c, 8d for mounting the switch 6 and the inside / outside air changeover switch 7 are formed.

  Thus, around the respective openings 8a of the three cylindrical holding portions 8A of the panel body 8, there are annular display plates 12, 13, and 14 indicating the selected positions of the respective operation knobs 10 as described later. They are bonded and fixed by ultrasonic welding. Here, although each display board 12-14 is comprised by translucent sheets, such as PC, as shown in FIG.1 and FIG.2, on each display board 12-14, the picture which shows an operation position, etc. Circular display portions 12a, 13a, and 14a on which symbols such as letters and numbers are printed by translucent ink are provided. And as shown in FIG. 2, the bending parts 12b-14b and 12c-14c bent by the back side by drawing process are respectively shown in the inner periphery and the outer periphery of the display parts 12a-14a of each display boards 12-14. Positioning convex portions 12d to 14d are integrally formed on the tops of the respective bent portions 12c to 14c on the outer peripheral side. Here, the bent portions 12b to 14b and 12c to 14c respectively formed on the inner and outer peripheral edges of the display portions 12a to 14a of the display plates 12 to 14 are formed as three holding portions 8A integrally formed with the panel body 8. Respectively. Further, the positioning convex portions 12d to 14d formed on the top portions of the bent portions 12c to 14c of the display plates 12 to 14 are engaged with the top portions of the outer circumferences of the holding portions 8A of the panel body 8. Positioning grooves 8e are respectively formed.

  By the way, as shown in FIG.1 and FIG.2, on the display part 12a of the display board 12 of the switch 2 for ventilation | gas_flow mode switching, the picture which shows the blowing location and blowing direction of a warm air or a cold wind is displayed as a symbol part, and air volume On the display unit 13 a of the display board 13 of the adjustment switch 3, numbers “0” to “4” indicating the size of the fan picture and the air volume are displayed as symbol parts, and the display board 14 of the temperature adjustment switch 4 is displayed. In the display portion 14a, characters "MAX A / C" and a scale indicating the temperature level are displayed as symbol portions. In each display part 12a-14a of these display boards 12-14, since parts other than a symbol part are printed with light-shielding ink, only a symbol part transmits light and this symbol part is displayed brightly.

  In addition, as shown in FIG. 2, dimming for adjusting light transmitted through the indicator portion 11 provided at the tip of each operation knob 10 is provided on the back surface of the three holding portions 8A of the panel body 8. The sheet 15 is attached by adhering the periphery with a double-sided tape 16. In the present embodiment, each light control sheet 15 is made of a resin such as PC, and a circular through hole through which a rotation shaft (not shown) of each operation knob 10 passes is provided at the center. 15a is formed.

  Next, of the three holding portions 8A formed on the panel body 8, the structure of one holding portion 8A corresponding to the temperature adjustment switch 4, the bonding structure and bonding method of the display plate 14 to the holding portion 8A are described. This will be described below with reference to FIGS. Since the structure of the other two holding portions 8A of the panel body 8 and the joining structure and joining method of the display plates 12 and 13 to these holding portions 8A are the same, description thereof will be omitted.

  4 is a perspective view of a holding portion provided on the panel body, FIG. 5 is an enlarged detail view of a portion A in FIG. 4, FIG. 6 is an enlarged detail view of a portion B in FIG. 4, and FIG. 8 is a partial plan sectional view of the operation panel, FIG. 9 is a partial plan sectional view showing a state before the display board is joined to the panel body, and FIG. 10 is a part showing a state after the display board is joined to the panel body. FIG.

  As shown in FIG. 4, the cylindrical holding portion 8A formed integrally with the panel main body 8 joins and holds the bent portions 14b and 14c formed on the inner and outer peripheral edges of the display portion 14a of the display plate 14, respectively. In this, an inner cylinder 17 and an outer cylinder 18 having an inner / outer double cylinder shape are formed. Here, an annular mounting groove 19 for positioning the operation knob 10 is formed between the inner peripheral surface of the holding portion 8A (the inner peripheral surface of the opening 8a) and the inner cylinder 17. At the edge of the peripheral surface (the inner peripheral surface of the opening portion 8a), an annular convex portion 20 for preventing rattling of the operation knob 10 and preventing light leakage is integrally formed. A stopper 21 for restricting the rotation of the operation knob 10 is integrally projected from a part of the inner peripheral surface of the holding portion 8A.

  Further, an opening 22 is provided at a position corresponding to the symbol portion (letter “MAX A / C” and temperature scale) of the annular space between the inner cylinder 17 and the outer cylinder 18 of the holding portion 8A. Are formed, and light from a light source (not shown) passes through the opening 22 to illuminate each symbol portion of the display panel 14.

  By the way, the inner cylinder 17 of the holding portion 8A of the panel body 8 is for joining and holding the inner bent portion 14b formed on the inner peripheral edge of the display plate 14, and the display plate 14 is formed with a stepped portion 17a having a large diameter (a diameter larger than the inner peripheral diameter of the inner cylinder 17 by the thickness of the bent portion 14b) for fitting the outer peripheral surface of the inner bent portion 14b. A plurality of first welding ribs 23 as shown in FIG. 5 are integrally formed at predetermined intervals in the circumferential direction on the end surface of the stepped portion 17a (stepped surface with the inner peripheral surface of the inner cylinder 17). Yes. Here, the depth length L1 of the stepped portion 17a formed on the inner periphery of the inner cylinder 17 is set longer than the depth length L2 of the bent portion 14b inside the display panel 14 (see FIG. 9). . Further, as shown in detail in FIG. 5, the first welding rib 23 is formed so as to expand toward the side farther from the side closer to the top (front end surface) of the inner cylinder 17 of the holding portion 8 </ b> A.

  The outer cylinder 18 of the holding portion 8A of the panel body 8 is for joining and holding the outer bent portion 14c formed on the outer peripheral edge of the display plate 14, and the display plate 14 is provided on the outer periphery thereof. A stepped portion 18a having a small diameter (smaller than the outer diameter of the outer cylinder 18 by the thickness of the bent portion 14c) for fitting the inner peripheral surface of the outer bent portion 14c is formed. A plurality of first welding ribs 23 as shown in FIG. 6 are integrally formed on the end surface of the portion 18a (step surface with the outer peripheral surface of the outer cylinder 18) at a predetermined interval in the circumferential direction. Here, the depth length L1 of the step portion 18a formed on the outer periphery of the outer cylinder 18 is set to be longer than the depth length L2 of the bent portion 14c outside the display plate 14 (see FIG. 9). Further, as shown in detail in FIG. 6, the first welding rib 23 is formed to expand toward the side farther from the side closer to the top portion (front end surface) of the outer cylinder 18 of the holding portion 8 </ b> A.

  Further, as shown in FIG. 4, a second welding rib 24 having a triangular rib shape (see FIG. 7) is provided at the front end edges of the inner cylinder 17 and the outer cylinder 18 of the holding portion 8 </ b> A of the panel main body 8. These second welding ribs 24 partially project at the positions corresponding to the translucent symbol part “MAX A / C” provided on the display part 14 a of the display panel 14. The notch 24a is formed by being cut out.

  Thus, the display panel 14 is joined to the holding portion 8A of the panel body 8 by ultrasonic welding. The joining method and joining structure will be described below with reference to FIGS.

  As shown in FIG. 9, the display plate 14 is fitted into the holding portion 8A of the panel body 8 from the direction indicated by the arrow (front side) with the bent portions 14b and 14c first. At this time, the positioning projection 14d formed on the outer bent portion 14c of the display plate 14 is engaged with the positioning groove 8e formed on the outer periphery of the holding portion 8A of the panel body 8, thereby Positioning in the circumferential direction is performed.

  When the display plate 14 is fitted into the holding portion 8A of the panel body 8 as described above, the outer peripheral surface of the inner bent portion 14b among the bent portions 14b and 14c of the display plate 14 is as shown in FIG. A plurality of stepped portions 17a formed on the inner periphery of the inner cylinder 17 of the panel body 8 are fitted to the inner cylinder 17 and the end surface and inner periphery thereof are circumferentially formed on the step surface of the inner cylinder 17 of the holding portion 8A. Abuts on the first welding rib 23. Further, the inner peripheral surface of the bent portion 14c on the outer side of the display plate 14 is fitted into a small-diameter stepped portion 18a formed on the outer periphery of the outer cylinder 18 of the panel body 8, and the end surface and inner peripheral surface thereof are the holding portion 8A. A plurality of first welding ribs 23 formed in the circumferential direction on the step surface of the outer cylinder 18. Here, the height (depth) of the stepped portions 17a and 18a formed in the inner cylinder 17 and the outer cylinder 18 of the panel body 8 is equal to the thickness of the bent portions 14b and 14c of the display plate 14, respectively. In a state where the bent portions 14b and 14c of the plate 14 are fitted into the inner cylinder 17 of the holding portion 8A of the panel body 8 and the stepped portions 17a and 18a of the outer cylinder 18, the inner peripheral surface and the inner surface of the bent portion 14b. The inner peripheral surface of the cylinder 17 and the outer peripheral surface of the bent portion 14c and the outer peripheral surface of the outer cylinder 18 form a continuous surface (a flush surface) without a step.

  As described above, when the inner and outer bent portions 14b and 14c of the display board 14 are fitted into the inner cylinder 17 and the outer cylinder 18 of the holding section 8A of the panel body 8, respectively, as shown in FIG. The back surface of the portion 14 a comes into contact with second welding ribs 24 formed on the top end surfaces (tip surfaces) of the inner cylinder 17 and the outer cylinder 18 of the holding portion 8 </ b> A of the panel body 8. At this time, as described above, the depth L1 of the stepped portions 17a and 18a formed in the inner cylinder 17 and the outer cylinder 18 of the holding portion 8A of the panel body 8 is set as the depth of the bent portions 14b and 14c of the display plate 14, respectively. Since it is set to be larger than the length L2 (L1> L2), the inner cylinder 17 and the outer cylinder are formed such that the end surfaces of the bent portions 14b and 14c of the display panel 14 are formed in the holding portion 8A of the panel body 8 as shown in FIG. The back surface of the display portion 14 a of the display panel 14 is in contact with the second welding rib 24 without being in contact with the 18 step surfaces.

  Thus, as described above, the inner and outer bent portions 14b and 14c of the display plate 14 are in contact with the first welding ribs 23 of the panel body 8, and the back surface of the display portion 14a of the display plate 14 is the first portion of the panel body 8. When the two welding ribs 24 come into contact with each other, the first welding rib 23 and the second welding rib 24 of the panel body 8 are joined to the bent portions 14b and 14c of the display plate 14 and the back surface of the display portion 14a by ultrasonic welding. 14 is fixed to the holding portion 8 </ b> A of the panel body 8. In ultrasonic welding, the entire periphery of the display plate 14 is covered with a horn (not shown), and the display plate 14 is pressed toward the panel body 8 by the horn, and in this state, the display plate 14 is subjected to ultrasonic vibration by the horn. Given. Then, the first welding rib 23 and the second welding rib 24 of the panel body 8 are melted, and the bent portions 14b and 14c of the display plate 14 and the back surface of the display portion 14a are joined and fixed to the holding portion 8A of the panel body 8. Is done.

  As described above, in the operation panel 1 according to the present embodiment, the first welding rib 23 formed in advance on the panel body 8 and the bent portions 14b and 14c of the display plate 14 may be joined by ultrasonic welding. Therefore, the display plate 14 can be fixed on the side wall of the holding portion 8A of the panel main body 8, and the inner peripheral edge and the outer peripheral edge are folded back so that the parting line cannot be seen, thereby forming the bent portions 14b and 14c. 14, the bent portions 14 b and 14 c can be securely fixed to the panel body 8 to prevent the floating thereof, and the operation panel 1 which is inexpensive and has a good appearance can be obtained.

  And in this Embodiment, since the 1st welding rib 23 provided in 8 A of holding parts of the panel main body 8 was formed so that the skirt spreads toward the side far from the side near the cylindrical top part of the holding part 8A of the panel main body 8. The side close to the top of the cylindrical portion of the holding portion 8A of the panel main body 8 of the first welding rib 23 enters the gap between the display plate 14 and the panel main body 8, and the side surfaces of the bent portions 14b and 14c of the display plate 14 and the panel The main body 8 is welded. Further, the side of the first welding rib 23 far from the cylindrical top of the holding portion 8 </ b> A of the panel body 8 is welded to the end surfaces of the bent portions 14 b and 14 c of the display plate 14. Accordingly, since the two sides of the bent portions 14b and 14c of the display plate 14 are welded to the panel main body 8 by the single first welding rib 23, the display plate 14 is more securely fixed to the panel main body 8. The If the first welding ribs 23 are welded to the panel body 8 on the side surfaces as well as the end faces of the bent portions 14b and 14c of the display board 14 in this way, variations in the shape and dimensions of the display board 14 and the panel body 8 are caused. The bent portions 14b and 14c of the display plate 14 can be securely fixed to the panel body 8 without being affected by the above. Incidentally, when the display plate 14 is welded to the panel body 8 only by the end surfaces of the bent portions 14b and 14c, the first welding rib 23 of the panel body 8 and the end surfaces of the bent portions 14b and 14c of the display plate 14 are connected. In some cases, the two cannot be welded because they do not contact each other.

  Further, in the present embodiment, the second welding rib 24 formed at the front end edge of the inner cylinder 17 and the outer cylinder 18 of the holding portion 8A of the panel body 8 is ultrasonically welded to the back surface of the display portion 14a of the display plate 14. Therefore, the display panel 14 is more firmly fixed to the panel body 8. In the present embodiment, stepped portions 17a and 18a are respectively formed in the inner cylinder 17 and the outer tube 18 of the holding portion 8A of the panel body 8, and the depth length L1 of the stepped portions 17a and 18a is set on the display plate 14. Since the depth length L2 of the bent portions 14b and 14c is set to be larger (L1> L2), the second welding rib 23 always comes into contact with the back surface of the display portion 14a of the display plate 14 and both are ultrasonically welded. The display unit 14a of the display plate 14 is securely fixed to the panel body 8.

  Further, in the present embodiment, since the notch 24a is formed at a position corresponding to the symbol part on the display plate 14 side of the second welding rib 24 of the panel body 8, the second rib 24 is formed in the notch 24a. The welded surface is not formed by ultrasonic welding to form the display panel 14, the translucency of the symbol part of the display board 14 is not impaired by the welded surface, and the symbol part is brightly illuminated by the transmission of light from the light source. The effect that the visibility is improved is acquired.

  Although the present invention has been described with respect to an embodiment in which the present invention is applied to an operation panel for controlling an in-vehicle air conditioner, the present invention is equipped with a rotatable operation knob that stops at a plurality of selected positions. Of course, the present invention can be similarly applied to any other operation panel.

DESCRIPTION OF SYMBOLS 1 Operation panel 2 Switch for ventilation mode 3 Switch for air volume adjustment 4 Switch for temperature adjustment 5 Rear differential switch 6 Air conditioner switch 7 Inside / outside air changeover switch 8 Panel body 8A Panel body holding part 8B Panel body housing 8a Panel body opening 8b to 8d Panel body rectangular hole 8e Panel body positioning groove 9 Appearance panel 10 Operation knob 11 Operation knob indicator section 12 to 14 Display panel 12a to 14a Display panel display section 12b to 14b Inside folding of display panel Part 12c-14c Bending part 12d-14d outside display panel Positioning convex part of display board 15 Light control sheet 15a Through hole of light control sheet 16 Double-sided tape 17 Inner cylinder 17a of panel body holding part 17a Step part of inner cylinder 18 Outer cylinder of holding part of panel body 18a Step part of outer cylinder 19 Mounting groove of panel body 20 Panel body protrusion 21 Panel body stopper 22 Panel body opening 23 Panel body first welding rib 24 Panel body second welding rib L1 Depth length of stepped portion of panel body L2 Bending portion of display board Depth length of

Claims (5)

In an operation panel formed by arranging an annular display plate indicating the selected position around the opening of the panel body having an opening to which a rotatable operation knob that stops at a plurality of selected positions is mounted.
Folding portions are formed by bending the inner and outer peripheral edges of the annular display portion of the display plate to the back side, and a cylindrical holding portion for holding the bent portion of the display plate is formed on the panel body. A plurality of first welding ribs are formed on the inner and outer side walls of the holding portion at predetermined intervals in the circumferential direction, and the first welding ribs are ultrasonically applied to the bent portion of the display plate. An operation panel characterized by joining by welding.   2. The operation panel according to claim 1, wherein the first welding rib is formed so as to expand toward the side farther from the side closer to the inner cylinder top of the holding portion of the panel body.   Second welding ribs are provided on the outer peripheral edge and the inner peripheral edge of the cylindrical top surface of the holding part of the panel body so as to project toward the display part of the display plate, and the second welding rib is provided on the back surface of the display part of the display plate. The operation panel according to claim 1, wherein the operation panel is joined to each other by ultrasonic welding.   4. The operation panel according to claim 3, wherein a translucent symbol portion is provided on the display portion of the display plate, and a notch portion is formed at a position corresponding to the symbol portion of the second welding rib. A step portion is formed in each of an inner peripheral portion and an outer peripheral portion of the holding portion of the panel body, and the depth length of the step portion is set to be larger than the depth length of the bent portion of the display board. Item 5. The operation panel according to any one of Items 1 to 4.

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