JPS59116021A - Electronic small-sized calculator - Google Patents

Abstract

PURPOSE:To enable storage and display of the max. tepm., min. temp., and respective time by providing a temp. measuring function and a clocking function. CONSTITUTION:A temp. measuring circuit 1 detects a temp. change as a voltage change, converts the same to a frequency change and supplies the frequency change to a counter 2 of a calculator 17. A reference signal generating circuit 18 forms a 1-sec signal and supplies said signal to the calculator 17. The frequency count value is converted to a temp. value in the calculator 17 and is stored together with the measuring time to an RAM5, and thereafter the measured value of this time is compared with the measured value up to the previous time and the max. value and min. value are stored together with the measuring time in the RAM5. The time measurement is accomplished by counting the time with the 1-sec signal and the time data is stored in the RAM5. The stored max. temp., min. temp. and measuring time are displayed on a display part 10 according to the input of a key 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a small electronic calculator, and particularly to a small electronic calculator having a clock function and a temperature measuring function.

(Prior Art) Since it is an electronic device such as a tabletop type that has a conventional degree measurement function, it does not have a function to memorize the time of the maximum temperature or minimum temperature. However, correct information regarding temperature can be obtained by knowing the time at which the maximum or minimum temperature occurs. Therefore, it is desired to realize a small electronic computer having such functions.

(Object of the invention) The present invention has been made in view of this point, and by adding a clock function, the maximum temperature, minimum temperature, and each time are automatically memorized and displayed by key operation. The purpose of the present invention is to provide a small electronic calculator with functions.

According to the present invention, the measurement time period can be set to any fixed time period, and the maximum temperature and minimum temperature can be set for each fixed time period, so that the temperature change period of the measurement target can be adjusted. It becomes possible to select the most suitable measurement method according to the speed and speed of temperature change.

(Structure of the Invention) The small electronic calculator of the present invention has a timekeeping means and a temperature measuring circuit, and automatically stores the maximum and minimum measured temperatures and the measurement times of the maximum and minimum temperatures. It is displayed by key operation.

(Explanation of Examples) The present invention will be described in detail below with reference to the drawings.

The figure shows a block diagram of an embodiment of the present invention.

Microcomputer 17 and temperature measurement circuit added to it 1. This embodiment is comprised of a reference signal generating circuit 18 for timekeeping, a key 8, and a display section 10. In addition, 2
is a counter, 3 is a crystal oscillator, 4 is a frequency dividing circuit for generating a 1 second signal, and 5 is a RAM.

6 is an ALU, 7 is a ROM, 8 is a group of keys, 9 is a display driver, 10 is a display section, 11 is an oscillation circuit for generating the microcomputer operation clock, 12 is an oscillation circuit 110 of the same circuit, 1
3 is a timing generator, 14 is a control circuit for the microcomputer 17, 15 is a pass line for the microcomputer 17, and 16 is a key output circuit.

For example, the temperature measurement circuit 1 performs temperature measurement using a thermistor and a V
A method is used in which a /F converter is used to detect a temperature change as @1 pressure change, convert it into a frequency change, and count the frequency using the counter 2 of the microcomputer 17. Reference signal generation circuit 1 for measurement and clock timing
8 is composed of, for example, a crystal oscillator 3 and an IN circuit 4,
The crystal oscillator 3 is caused to oscillate and passed through the frequency dividing circuit 4 to obtain a 1 second signal, which is used as a clock ticking signal and a gate time signal for the frequency count. This frequency count value is temporarily stored in R, AM5 of the microcomputer 17, and then converted into a temperature value by R, OM 7 using ALU6, and temporarily stored in RAM5 along with the measurement time. Store in. For each measurement, the current measured value is compared with the previous measured values, and the highest and lowest values are stored in the RAM 5 along with the measurement time.

The clock uses this 1 second signal to count the time, and the time data is stored in R and AM6.

Incidentally, the time interval between the measurement times can be fixed in the ROM 7 or can be specified manually using the keys 8.

Furthermore, the measurement time range that defines the maximum and minimum values of the measured values can also be fixed in the ROM 7 or specified manually using the keys 8. For example, by measuring every minute, it is possible to store the maximum and minimum temperatures within 24 hours a day and the time of each measurement. The stored maximum temperature, minimum temperature, and measurement time are displayed on the display section 10 through the display driver 9 using the keys 8 manually.

Note that the temperature measurement circuit 11 is configured separately from the main body of the computer, and is connected to the main body by a cable, so that the temperature measurement circuit portion can be detachably attached to the main body.

(Effects of the Invention) As explained in detail above, the small electronic calculator of the present invention has a temperature measurement function and a timekeeping function, so it can, for example, know the maximum and minimum temperature values together with the time values of their occurrence. This has the effect that detailed information on temperature can be obtained.

[Brief explanation of drawings]

The figure is a block diagram of one embodiment of the present invention. In the figure, 1...Temperature detection circuit, 2...Key, 10
. . . Display section, 17 . . . Microcomputer, 18 . . . Reference signal generation circuit for timekeeping.

Claims (4)

[Claims] (1) A small electronic device that has a timekeeping means and a temperature measurement means, and is characterized by automatically storing the maximum and minimum measured temperatures and the measurement times of the maximum and minimum temperatures and displaying them by key operation. calculator. (2) The temperature measurement time can be set at arbitrary predetermined time intervals by the key operation.
The small electronic calculator described in item 1). (3) The electronic compact calculator according to claim 1 or 2, characterized in that the measurement time range of maximum temperature and minimum temperature can be arbitrarily set by operating the keys. (4) Temperature measurement as described in l'iiJ Temperature measurement means configured separately,
Item (1) characterized in that the temperature measuring means and the main body are connected by a cable, and the temperature measuring means is detachable from the main body.
(2) or (3).