Sony (SNE) said it will extend the closure of its image sensor plant in Kumamoto, which is in the southern island of Kyushu, after major tremblors on Thursday and Saturday rocked the key manufacturing region.

The PlayStation maker said operations at its image sensor plant in Nagasaki, also in Kyushu, will be partially suspended and it does not yet have a timeline for full resumption of operations.

Sony controls about 40% of the market for complementary metal-oxide semiconductor (CMOS) image sensors, a type of integrated circuit that converts light into electrical signals. In smartphones they are used to convert images into digital data.

“We are not expecting any immediate supply disruption as we have some inventories right now,” a Sony spokesman told Reuters on Saturday. “We will make an announcement promptly if any supply issues emerge.”

He said the company was hoping to resume operations as soon as aftershocks end, and would probably provide an update on late Monday afternoon. “We are still checking for potential damage to the plants, which usually operate on a 24-hour basis,” he said.

Apple (AAPL) could not be immediately reached for comment.

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Sony has two other CMOS image sensor plants in Japan.

Samsung (SSNLF) says it has diversified its sources for image sensors used in its smartphones and the quakes will have no impact on its flagship products.

A devastating earthquake and tsunami in northern Japan in March 2011 temporarily knocked out part of Japan’s auto supply chain. Some companies have since adjusted the industry’s “Just in Time” production philosophy to limit any repeat of that costly disruption.

Other electronics makers were also forced to stop production in Kyushu, which has grown as a manufacturing hub over the past two decades. Kyushu accounts for roughly 25% of semiconductor output in Japan by some estimates.

Renesas Electronics closed its Kumamoto plant, which produces microcontroller chips for automobiles. It will not resume production until it completes its damage assessment.

Mitsubishi Electric (MITSUBISHI-ELEC) halted production at its two Kumamoto plants which produce liquid crystal display modules used in display panels for car navigation systems and semiconductor chips used in power inverters for various electrical products, including air conditioners and hybrid or electric vehicles. It uses some of the products itself and provides others to customers.

“We are still assessing the situation as we continue to have aftershocks,” said a Mitsubishi spokesman.

AUTOMAKERS HALT PRODUCTION

Saturday’s natural disaster also impacted major automakers, which had just stopped their production lines to inspect for any damage from Thursday’s earthquake.

Honda (HMC) halted production at its Kumamoto motorcycle plant, which has annual production capacity of 250,000. It said it will keep production on hold through Monday.

Toyota (TM) halted production at three plants producing vehicles, engines, and trans axles in Fukuoka. Toyota said there was no damage at its plants, but it was checking the status of its suppliers. It will decide on Sunday whether to resume production.

Nissan (NISSAN-MOTOR) stopped production at its Fukuoka plant which produces vehicles including the Serena, Teana, Murano, and Note.

Kumamoto prefecture accounts for about 1.1 % of Japanese GDP, compared to the combined 6.2% of the four prefectures which suffered the heaviest damage from the 2011 natural disaster, according to strategists at Barclays.

“A relatively higher proportion of Kyushu’s economic activity takes place within the region itself. Therefore economic impact on the rest of Japan stemming from any damages to Kyushu’s manufacturing activity will be limited,” Barclays wrote in a note to clients.