Non-burning-type flavor inhaler

1. A non-burning type flavor inhaler, comprising:

a housing having an airflow path that continues from an inlet to an outlet;

an atomizer configured to atomize an aerosol source without burning;

a sensor including a capacitor, the sensor outputting a value indicating electric capacitance of the capacitor, the electric capacitance changed depending on a puff action of a user; and

a controller configured to detect a start or an end of a puff duration on the basis of an output value that is output from the sensor,

wherein the controller comprises a puff detection portion configured to detect the start or the end of the puff duration when an inclination formed by two or more of the output values has a predetermined sign and when an absolute value of the inclination having the predetermined sign is larger than a predetermined value.

2. The non-burning type flavor inhaler according to claim 1 , wherein

a cycle for monitoring the output value output from the sensor before detecting the start of the puff duration is shorter than a cycle for monitoring the output value output from the sensor after detecting the start of the puff duration, and

a cycle for monitoring the output value output from the sensor after detecting the end of the puff duration is shorter than a cycle for monitoring the output value output from the sensor before detecting the end of the puff duration.

3. The non-burning type flavor inhaler according to claim 1 , wherein

Δt represents a cycle for monitoring the output value output from the sensor,

D(n) represents the output value output from the sensor at a time t(n),

α(n) represents a positive integer,

S(n) represents an inclination formed by the output value output from the sensor at a time t(n),

the puff detection portion calculates the inclination formed by the output value output from the sensor based on S(n)={D(n)−D(n−α(n)×Δt)}/(α(n)×Δt),

the puff detection portion detects the start or the end of the puff duration when a condition in that S(n) is a value of the predetermined sign and an absolute value of S(n) is larger than a first value is satisfied for consecutive m times (m is an integer of 2 or more) of S(n).

4. The non-burning type flavor inhaler according to claim 3 , wherein

a sampling cycle of the output value that is referenced upon detecting the start or the end of the puff duration is longer than a predetermined time, and

the predetermined time is longer than ½ of an average value of wavelength of the output value varied in the puff duration.

5. The non-burning type flavor inhaler according to claim 3 , wherein

the puff detection portion detects the start or the end of the puff duration when a condition that S(n) is a value of the predetermined sign and an absolute value of S(n) is smaller than a second value is satisfied for one time of the consecutive m times of S(n), and

the second value is an average value of an absolute value of the inclination formed by the output value varied in the puff duration.

6. The non-burning type flavor inhaler according to claim 1 , wherein the sensor is a capacitor microphone sensor.

7. The non-burning type flavor inhaler according to claim 1 , comprising a switch member used for starting and stopping a supply of power source output to the controller and the sensor.