JPS6042434Y2 - timer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electronic timer, and was devised specifically for the purpose of displaying the passage of time.

Conventionally, one method for manufacturing a long-time timer is to provide an oscillation circuit, apply the pulse output of this oscillation circuit to a time-limiting capacitor, and gradually accumulate a certain amount of charge in the time-limiting capacitor. It is known that a time-up signal is obtained by detecting that the electric charge (therefore, the potential) of the device has reached a predetermined value.

In this method, the time limit is changed by changing the oscillation cycle of the oscillation circuit.

Therefore, since this conventional timer changes the oscillation period, it has the disadvantage that it is difficult to stabilize the circuit characteristics against external changing factors such as temperature characteristics.

The timer of this invention eliminates the above-mentioned drawbacks and is also capable of displaying the passage of time.

This invention will be explained below with reference to the drawings.

Fig. 1 shows an example of the circuit configuration of the timer of this invention, where 100 is a reference oscillation circuit that generates pulses at a constant cycle, and is adjusted to a predetermined oscillation cycle by a semi-fixed resistor R1 and a capacitor C1. It is then fixed.

The pulse output from the oscillation circuit 100 is applied to the timer capacitor C via the transistor TR, and a certain amount of charge is accumulated in the timer capacitor C in stages.

vR is a variable resistor for giving an initial charge to the time capacitor C, RA is a variable resistor ■3, and the time capacitor C
This is an adjustment resistor for adjusting variations in components such as.

Reference numeral 101 denotes a potential detection and display circuit that detects the potential of the time limit capacitor C and displays it at fixed potential intervals, and 102 receives a signal from the potential detection and display circuit 101 when the potential of the time limit capacitor C reaches a predetermined value. This is an output circuit that receives the signal and generates an output.

FIG. 2 is a drawing showing the circuit configuration of the potential detection and display circuit 101, which is composed of a potential detection circuit 103 and display light emitting diodes Lo-Ln.

FIGS. 3 and 4 are drawings showing an example of the external appearance of the timer of this invention, with FIG. 3 showing the front side and FIG. 4 showing the side view.

200 is a timer body, 201 is a time limit setting knob, and has a setting pointer 202.

The adjustment shaft of the variable resistor VR that provides an initial potential to the time capacitor C is connected to the time setting knob 201, and when the pointer 202 indicates the maximum scale (20 in the drawing), the time capacitor C is adjusted. The initial potential applied to the time capacitor C is zero when the minimum scale (O in the drawing) is indicated.
The voltage is adjusted to a potential that drives 2.

b to Ln are the same as the light emitting diodes b to Ln shown in FIG.

Now, turn the knob 201 as shown in Figure 3, and turn the pointer 2.
02 and when the power is turned on to the circuit, a predetermined initial potential is applied to the time capacitor C, which is detected by the potential detection and display circuit 101, and the light emitting diodes from the maximum scale to the set scale are sequentially lit.

Next, when a timer start signal (not shown) is given, the oscillation circuit starts oscillating, a pulse input is given to the time capacitor C, and a constant charge is accumulated step by step. The potential increases.

Further, each time the potential of the time limit capacitor C increases by a certain amount, the light emitting diodes are sequentially turned on from the set scale toward the zero scale.

Then, at the same time that the potential of the time capacitor C reaches a predetermined potential and the light emitting diode Ln lights up, a signal is transmitted to the output circuit 102, and the output circuit 102 is driven and the time limit ends (time-up).

The oscillation circuit 100 (not shown) is configured to stop oscillating when the output circuit 102 is driven, and the terminals of the time capacitor C are short-circuited to discharge the charged charge using a well-known method. It is configured to be ready for the next timed operation.

As explained in detail above, according to the timer of this invention,
Since the oscillation period is constant, stable characteristics can be obtained against external changing factors such as temperature characteristics, and therefore there is no time error.

Furthermore, since the elapsed time is displayed, the timer is very easy to use and has the advantages of a conventional motor timer and an electronic timer.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the main part of the circuit configuration of a timer which is an embodiment of this invention, Figure 2 is a diagram showing the configuration of a potential detection display circuit, and Figures 3 and 4 are diagrams showing the circuit configuration of a timer according to this invention. FIG. 3 is a drawing showing an example of the external shape, and FIG. 3 shows a front side, and FIG. 4 shows a side view. 100...Reference oscillation circuit, 101...
Potential detection display circuit, 102...Output circuit, 20
1...Knob for time limit setting, 202...
Pointer, Lo"-Ln... Light emitting diode, C.
...Time limit capacitor, ■8...Variable resistor.

Claims (1)

[Scope of utility model registration request] In a timer equipped with an output circuit that generates an output when the potential generated according to the charge accumulated in the time capacitor reaches a preset potential, the timer includes an oscillation circuit that generates pulses at a constant cycle, and a circuit for inputting the pulse output of the oscillation circuit to the time capacitor; a variable resistor for giving an initial potential to the time capacitor and setting a time limit; 1. A timer comprising: a potential detection display circuit that drives a display means at every fixed potential, and the display means displays the passage of time.