KR960001836Y1 - Paging apparatus - Google Patents

Abstract

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Description

Page device for finding position of object

Figure is a detailed circuit diagram of the page device for easily finding the position of the object constructed in accordance with the present invention

* Explanation of symbols for main parts of the drawings

10: alarm generating unit 20: reset unit

PTl, PT2: Phototransistor P: Piezo Buzzer

FF: flip flop

The present invention relates to a page apparatus for easily finding a placement place of a predetermined object, and more particularly, to a page apparatus for generating a signal from a hidden position by adjusting a light applied to an object to be found.

There may be a number of page objects, and among them, a remote control for electronic device remote operation used as an example in an embodiment of the present invention may be placed in an inconspicuous place of the user due to carelessness during use. In the case of cordless phones, there is a watch search function called a page function which means to call and find someone.

This feature is configured to generate a sound from the handset when a page button on the phone body is pressed to easily locate the cordless phone.

The principle is that the telephone body transmits a certain frequency within a certain distance, and the handset receives and detects this frequency to generate sound. This function is convenient, but has the following problems to use in a remote control such as a VCR. First, a circuit for oscillating and transmitting a specific frequency should be employed in the main body of the electronic device using the remote control. Second, a receiving circuit for receiving a specific frequency from the remote control should always be operated. Third, for the operation of the receiving circuit. There is a problem that the battery power is consumed, and the overall cost increases.

Therefore, the present invention has been devised to achieve a simpler and cheaper page function, and an object thereof is to provide an apparatus capable of independently performing a page function.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a page apparatus according to the present invention is shown. The page apparatus is largely composed of two parts, that is, the alarm generator 10 and the reset unit 20. The alarm generating unit 10 detects when the page object is hidden, that is, when the light is blocked, and generates an alarm sound, and the reset unit 20 does not generate an alarm sound when it is unnecessary in the normal state of the light off. This is to avoid.

The alarm generating unit 10 includes photo transistors PT1 and PT2, resistors R1, R2 and R3, diodes D1, D2 and D3, switching transistors Q1, and capacitors ( C1) and piezo buzzer 9.

The photo transistors PT1 and PT2 may be installed one each in front and rear of the page object. This is to prevent a malfunction state caused by blocking of light by blocking any one photo transistor installed on one side when the page object is placed as described below. In this case, the light receiving surface of the photo transistor should face outward from the front and rear surfaces of the page object.

In addition, the resistor R3 and the capacitor C1 of the alarm generator 10 constitute a time constant circuit that performs a delay function during the time constant.

This time constant circuit prevents the piezo relief P from operating even if the photo transistors PT1 and PT2 are operated for a short time. (D1), (D2), and (R3) are turned off when the photo transistors PT1 (PT2) are all blocked, that is, when the collector voltages of (PT1) and (PT2) become "H" states. When the point "A" is in the "H" state (PT1) and any one of the (PT2) is in the ON state, the AND gate circuit is formed in which the "A" point is in the "L" state. When the collector potential of PT1) or (PT2) is in the "L" state, the transistor Q1 is prevented from malfunctioning by VF of (D1) or (D2) (C1) is a noise removing capacitor. Used.

When the page object is disposed in a dark place, light incident to the photo transistors PT1 and PT2 is blocked, so that the phototransistor is turned off. Thus, the diodes D1 and D2 respectively connected to the collectors of the transistors PT1 and PT2 are turned off. The point A, which maintains a low ("L") level when no light is blocked, is delayed for a period of time by a time constant circuit composed of a resistor (R3) and a capacitor (C1) and then brought to a high ("H") level state. do. As a result, current is provided to the transistor Q1 through the diode D3 to turn on the transistor Q1 so that the battery VB voltage is supplied to the piezo buzzer and an alarm sound is generated.

The alarm generating unit 10 of the page apparatus according to the present invention may generate an alarm sound even in the case of extinction. Therefore, the page apparatus according to the present invention includes a reset circuit unit 20 for stopping such unwanted alarm sound generation.

The reset circuit section 20 includes resistors R4, R5, R6, and R7, an electrolytic capacitor C2, a reset switch SW, a D flip-flop FF transistor Q2, and Q3. It consists of). First, the truth table of the D flip-flop (FF) is shown in Table 1 below.

TABLE 1

When either or both of the photo transistors PT1 or PT2 are on (if there is light), the "A" point is in the "L" state, and thus the base of the transistor Q2 is in the "L" state. Q2) is turned off. Therefore, since the R terminals of the flip-flops FF are H states and the S terminals are L states, the output Q is maintained in the "L" state according to Table 1, and thus the transistor Q3 is turned off, and thus the reset switch ( It does not change when you press SW). That is, when the page object in which the circuit is embedded is in a bright place, the circuit unit 20 does not perform any operation.

However, when light is blocked in both the photo transistors PT1 and PT2, the piezo relief P emits an alarm sound as described in the alarm generation circuit unit 10. First, the "A" point becomes the "H" state, so the transistor Q2 is on and the (R), (S), and (D) terminals of the current flip-flop (FF) are ("L") and ("L", respectively. ")" And "L" state. At this time, when the switch SW is pressed, the state of the (CLK) terminal is changed from low to high (), so the output Q is from the "L" state to the "L" state, so the transistor Q3 is turned on and thus the transistor ( Since the base potential of Q1) is changed from the "H" state to the "L" state, the transistor Q1 is turned off and the alarm sound of the piezo buzzer is turned off. On the other hand, when the switch SW is pressed and released, the (CLK) terminal state is changed from high to low (), so that the current state is maintained. Therefore, each time the reset switch SW is pressed and released, the output terminals Q and ( ) State is reversed and alarm sound is generated and stopped. Thus, the reset unit 20 can stop the generation of unwanted alarm sounds as in the case of the extinguishing.

In addition, as soon as the page object equipped with this circuit emerges from a dark place to a bright place, as described with respect to the alarm generating unit 10, the "A" point becomes an "L" state, so that the alarm sound is automatically cut off.

As described above, the page apparatus according to the present invention generates an alarm sound even when the lights are turned off, and thus may also play a role of generating an alarm sound to turn on a light.

In other words, if the page object is in another place in the house, the alarm will not be generated if the place is not dark, but if the page is turned off, the alarm will be generated so that the page object can be easily found and stored in an appropriate place.

Therefore, the page apparatus according to the present invention as described above provides the convenience of easily finding the object immediately when the location of the page object is unknown.

Claims (3)

An apparatus for generating an alarm sound for locating a page object in a dark state; At least one photo transistor on at least one surface of the page object; Time constant circuits (R3, C1) for delaying a predetermined period when the light of the photo transistor is cut off; A switching transistor Ql which is turned on after the predetermined period of time by the time constant circuit to provide power; An alarm sound generating means (P) for starting to generate an alarm sound in response to the operation of the transistor (Q1). The method of claim 1, Further comprising a reset unit 20 for stopping the alarm sound generation, the reset unit 20; A reset switch (SW) for resetting the alarm sound generation; A transistor Q7 connected to bypass the current to the transistor Q1 to ground; And a flip-flop (FF) for turning on the transistor (Q7) by inverting its output state in response to an operation of the reset switch (SW). The method of claim 1, And the photo transistors are disposed on both sides of the page object, respectively.