JPH0588058U - Door phone - Google Patents

Abstract

(57) [Summary] [Purpose] To make calls clear. A doorphone subunit 10 is provided with a housing 11 having a speaker sound hole 11f and a microphone sound hole 11g on the front surface, and a cover 13 attached so as to cover the front surface of the housing. A concave portion 11m that surrounds either the sound hole or the sound hole for the microphone is formed on the front surface of the housing, and also a convex portion that enters the recess and surrounds either the sound hole for the speaker or the sound hole for the microphone. 13c was formed on the cover.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intercom sub-unit, which is an intercom device for making a call between a visitor and a resident.

[0002]

[Prior Art]

 Recently, when a resident makes a call with a visitor who has visited the front door, an intercom device with a monitor TV is used that allows the caller to check the appearance of the visitor on the monitor TV. Such an intercom device with a monitor TV is composed of an intercom base unit with a monitor TV installed in the living room of the house and an intercom subunit installed at the entrance of the house.

3 to 5 are views for explaining an intercom device of the intercom device with a monitor television as described above. FIG. 3 is a partially cutaway front view, and FIG. 4 is embedded in a wall surface. FIG. 5 is a partially cutaway side view showing the state in which the above is done, and FIG. Note that FIG. 5 shows a cross section of the X-X step shown in FIG.

As shown in FIGS. 3 and 4, the intercom subunit 10 includes a housing 11 that is a substantially box-shaped plastic molded product, and a mounting frame 12 that is mounted on the peripheral side surface of the housing 11 in a brim shape. And a cover 13 which is attached to the attachment frame 12 and covers the front of the housing 11.

The housing 11 includes an image pickup camera 11a for picking up an image of a visitor, a speaker 11b for outputting the voice of a resident, a microphone 11c for picking up the voice of the visitor, and a push button for ringing a chime to notify the visitor. A switch 11d and a switch 11d are provided respectively. A plurality of slit holes 11f are provided in the front surface of the housing 11 in front of the speaker 11b, and slit holes 11g are provided in the front surface of the housing 11 in front of the microphone 11c. A groove 11h surrounding the slit holes 11f and a groove 11i surrounding the slit holes 11g are formed on the front surface of the housing 11. An annular sponge packing 11j is inserted in the groove 11h, and an annular sponge packing 11k is inserted in the groove 11i. The sponge packing 11j projects slightly from the groove 11h, and the sponge packing 11k also projects slightly from the groove 11i.

The attachment frame 12 is provided with a plurality of attachment holes 12 a for screwing and attaching the housing 11 to the wall surface A. The cover 13 is provided with an image pickup window 13a formed of a transparent plate material and a switch hole 13b for the push button switch 11d, and at positions where the speaker 11b and the microphone 11c face each other. A sound passage hole (not shown) is provided. A light emitting diode 11e is provided in the center of the front surface of the push button switch 11d. This light emitting diode 11e is turned on when an intercom base unit with monitor TV (not shown) detects an abnormality such as a fire or gas leak in the house, and the house is not only for the resident but also for a third party. This is for notifying internal abnormality.

The intercom subunit 10 as described above is embedded and attached to the wall surface A at the entrance as follows. That is, the wall surface A is provided with a wall surface opening A ₁ which is an opening hole slightly larger than the housing 11. Then, the housing 11 is pushed into the wall surface opening A ₁ from the back side. Then, with the back surface part of the housing 11 entering the wall surface opening A ₁ to some extent, the attachment frame 12 attached to the peripheral side surface of the housing 11 in a brim shape is attached to the peripheral edge of the wall surface opening A ₁ . When they come into contact with each other, the housing 11 cannot be pushed any further. In this state, when tightened through wood screws (not shown) to an appropriate person for attachment hole 12a, the housing 11 together with the attached frame 12 is fixed to the peripheral edge of the wall opening A ₁ is the wall opening A ₁ Fixed. After that, the cover 13 is attached to the attachment frame 12 so as to cover the front surface of the housing 11.

[0008]

[Problems to be solved by the device]

At this time, if the wall surface A is a flat surface without irregularities, as shown in FIG. 4, the annular sponge packing 11j or sponge packing 11k adheres to the inner surface of the cover 13 over the entire circumference. However, as shown in FIG. 5 when the wall surface A has irregularities, when the peripheral edge of the cover 13 rides on the convex portion A ₂ of the wall surface A and the cover 13 is lifted from the front surface of the housing 11, the annular shape The sponge packing 11j and the sponge packing 11k do not come into close contact with the inner surface of the cover 13 to form a gap. Then, the voice of the resident from the speaker 11b is output to the outside of the intercom subunit 10 through a sound passage hole (not shown) provided in the cover 13 at a position facing the speaker 11b, but the speaker 11b. A part of the voice of the resident from is picked up by the microphone 11c quite strongly along the route shown by the dotted line B in FIG. Therefore, a positive feedback loop of speaker 11b → microphone 11c → speaker 11b is formed, causing oscillation and howling. For this reason, there was a problem in that the call between the resident and the visitor became difficult to hear due to howling and a call failure occurred.

The present invention has been made to solve the above problems. The purpose of the present invention is that howling does not easily occur even when the cover is lifted from the front surface of the housing, and the visitor and the visitor can visit the housing. Another object of the present invention is to provide an intercom subunit that enables clear communication between people and people.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is a door phone having a housing having a sound passage hole for a speaker and a sound passage hole for a microphone on the front surface, and a cover attached so as to cover the front surface of the housing. In the container, a recess that surrounds one of the speaker sound hole and the microphone sound hole is formed on the front surface of the housing, and the recess is inserted into the recess to connect the speaker sound hole and the microphone sound hole. It is characterized in that a convex portion surrounding either one is formed on the cover.

[0011]

[Action]

 With the above structure, when the cover is attached to the front surface of the housing, the convex portion of the cover is inserted into the concave portion of the housing. Then, the path through which the sound output from the speaker reaches the microphone through the gap between the front surface of the housing and the inner surface of the cover is blocked. Then, the sound output from the speaker is blocked and it is difficult to reach the microphone.

[0012]

【Example】

 Hereinafter, one embodiment of the intercom subunit according to the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a sectional view of an essential part showing a state that the intercom subunit is embedded in a wall surface, and FIG. 2 is a partially cutaway front view showing the intercom subunit. It should be noted that FIG. 1 shows a cross section of the Y-Y line staircase shown in FIG. Since the same parts as those of the conventional one are designated by the same reference numerals, the description of the same parts as those of the conventional one will be omitted.

As shown in FIGS. 1 and 2, the intercom sub-unit 10 is different from the conventional one in that it has a step 11 m corresponding to a recess on the front surface of the housing 11 and a cover 13 That is, the rib 13c corresponding to the convex portion is provided. The stepped portion 11m is a portion which is recessed from the front surface of the housing 11 by one step, and is continuously formed so as to surround the slit hole 11g corresponding to the microphone sound passage hole. When the cover 13 is attached so as to cover the front surface of the housing 11, the rib 13c is inserted into the stepped portion 11m of the housing 13 while the tip end portion of the rib 13c is inserted into the rib 13c, and the rib 13c is substantially attached to the surface of the stepped portion 11m. It is formed continuously so as to abut.

Therefore, when the cover 13 is attached so as to cover the front surface of the housing 11, the step portion 11m and the rib 13c are combined, so that the cover 13 is attached to the housing 11 as shown in FIG. Even if it rises from the front, the voice output from the speaker 11b does not reach the microphone 11c through the gap between the housing 11 and the cover 13 through the path shown by the dotted line B in FIG. The sound is insulated by 11 m and the rib 13c.

The present invention is not limited to the above embodiment, and the recess is provided so as to surround the plurality of speaker sound passage holes 11f, and the recessed portion surrounds the plurality of speaker sound passage holes 11f. You may make it form the convex part which penetrates into the cover 13. Moreover, the relationship between the concave portion and the convex portion may be reversed.

[0016]

[Effect of the device]

 Since the intercom subunit of the present invention is configured as described above, even if the cover floats from the front of the housing, the sound output from the speaker sound hole on the front of the housing is The sound that reaches the sound hole for the microphone through the gap with the inner surface of the cover is attenuated and howling can be prevented. Therefore, there is an effect that it is possible to provide an intercom subunit that allows clear communication between the resident and the visitor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing a state in which an intercom subunit of an embodiment according to the present invention is embedded and mounted on a wall surface.

FIG. 2 is a partially cutaway front view showing an intercom subunit according to an embodiment of the present invention.

FIG. 3 is a partially cutaway front view showing a conventional intercom subunit.

FIG. 4 is a partially cutaway side view showing a state in which a conventional intercom subunit is embedded and attached to a wall surface.

FIG. 5 is a cross-sectional view of essential parts showing a state in which a conventional intercom subunit is embedded and attached to a wall surface.

[Explanation of symbols]

 10 Doorphone subunit 11 Housing 11b Speaker 11c Microphone 11f Speaker sound hole 11g Microphone sound hole 11m Recessed portion 13 Cover 13c Convex portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Kaichi Tatsumi 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An intercom sub-unit comprising: a housing having a speaker sound-transmitting hole and a microphone sound-transmitting hole on a front surface thereof; and a cover attached to cover the front surface of the housing.
A recess is formed on the front surface of the housing to surround either one of the speaker sound hole and the microphone sound hole, and one of the speaker sound hole and the microphone sound hole is inserted into the recess. An intercom sub-unit, characterized in that a convex portion surrounding the is formed on the cover.