Temperature measurement device

• US 4,728,199 A
• Filed: 12/31/1985
• Issued: 03/01/1988
• Est. Priority Date: 12/31/1985
• Status: Expired due to Fees

• Current Assignee: Kyushu Hitachi Maxell Ltd. (Maxell, Ltd.)
• Original Assignee: Kyushu Hitachi Maxell Ltd. (Maxell, Ltd.)
• Inventors: Murai, Toshio, Imagawa, Isao, Murata, Junzo, Hosono, Masahiro
• Primary Examiner(s): Frankfort, Charles
• Assistant Examiner(s): Will, Thomas B.
• Application Number:
  US06/815,058
• Time in Patent Office: 791 Days
• Field of Search: 374/163, 374/170, 374/183, 374/186, 128/736, 364/557
• US Class Current: 374/170
• CPC Class Codes: G01K 1/02 Means for indicating or recording specially adapted for thermometers
• CPC Class Codes: G01K 1/026 arrangements for monitoring a plurality of temperatures, e.g. by multiplexing

Abstract

In a temperature measurement device, output signals from a temperature measuring sensor having been stored in a recording element are displayed when a judging element detects that a manipulatable switch is closed. Temperature measurement is begun including displaying the temperature when said judging element detects that the switch is opened after it is closed.

Claims

1. A temperature measurement device comprising:

a single operator actuatable switch manipulatable from outside the device, said switch having open and closed states;

temperature measurement means for measuring a temperature of interest and developing a temperature signal representative thereof;

judging means, monitoring said operator actuable switch, for detecting whether said dswitch is in said open state or in said closed state;

recording means for storing sid temperature signal developed by said temperature measurement means; and

display means for displaying a temperature represented by a temperature signal provided thereto;

said judging means, upon detecting said switch is in said closed state, recalling the temperature signal representative of a previous temperature stored in said recording means and supplying said temperature signal to said display means for display thereon, said judging means, upon detecting an open state of said switch subsequent to said closed state, supplying the temperature signal developed by said temperature measurement means and representative of a current measured temperature to said display means for display thereon;

said previous temperature being displayed on said display means for as long as said switch is held in said closed state.

2. A temperature measurement device as claimed in claim 1, further comprising detecting means provided between said recording means and said display means, for monitoring said temperature signal recalled from said recording means by said judging means fand for detecting whether said temperature signal stored in said recording means is representative of a previously stored temperature outside a predetermined range of the temperatures, said detecting means developing a detected signal for supply to said display means to be displayed thereby while said judging means detects that the switch is in the closed state.

3. A temperature measurement device as claimed in claim 1, further comprising a counter, enabled by the detection by said judging means of an open switch state subsequent to a closed switch state, for counting a predetermined time period and developing a counter output;

said display means including a digital display including a plurality of segments and means for driving said display;

said means for driving being responsive to said counter output to drive all said segments of said display means during said predetermined time period from when a previously measured temperature is indicated until a presently measured temperature is started to be displayed.

4. A temperature measurement device as claimed in claim 3, wherein said judge means, responsive to said counter output, resets said recording means signal from said detecting means upon completion of said predetermined time period, and at the same time, the display of the temperature outside the predetermined range is developed by said display means until output signals within said range to be supplied to the recording means from the temperature measuring means are generated.

5. The device of claim 3, wherein a subsequent actuation of said switch to said closed state will enable said judging means to store said temperature signal representative of a present temperature in said recording means as a new previous temperature.